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Two observers $A$ and $B$ are moving opposite to each other on a parallel track, separated by a distance $d,$ with the same speed. When they are at the shortest distance, a particle is thrown horizontally from some height from the ground by $A$ towards $B$ with respect to itself. The path of the particle observed by $B$ is -

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Important Questions on Kinematics

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 23

A cyclist observes a passenger in a bus. He finds that the passenger closed his glass window displacing $20 cm$ in forward direction with constant speed in $1 \sec .$ Bus overtakes the cyclist in $3 \sec .$ Initially he was at the middle of the bus as shown in the figure. Length of the bus is $18 m .$ Both cyclist and bus are moving with constant speed in the same direction. Then the velocity of the glass window with respect to cyclist was:

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 24

A boat moving towards east with velocity

4 m s^{- 1}

with respect to still water, and the river is flowing towards north with velocity

2 m s^{- 1}

, and the wind is blowing towards north with velocity

6 m s^{- 1}

. The direction of the flag blown over by the wind hoisted on the boat is

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 25

Man

A

is sitting in a car moving with a speed of

54 km h^{- 1}

observed a man

B

in front of the car crossing perpendicularly a road of width

15 m

in three seconds. Then what will be the velocity of man

B

? (in

m s^{- 1}

)

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 26

A river is flowing with a velocity of

1 m \sec^{- 1}

toward east direction. When the boat runs with a velocity of

3 m s^{- 1}

relative to the river in the direction of the river flow, the flag on the boat flutter in the north direction. If the boat runs with the same speed but in the north direction relative to the river, the flag flutters towards the northeast direction. The actual velocity of the wind (relative to the ground) should be: (

\hat{i} =

east direction and

\hat{j} =

north direction)

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 27

Hail stones falling vertically with a speed of

12 \sqrt{3} m / s

hits the windscreen which makes an angle

30 °

with the horizontal. If car is running at velocity

V

(in

m / s

) so that the driver find the hail stone striking perpendicular to the windscreen. Find the value of

V / 2 ?

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 28

A man is on the ship which is moving in the east direction with speed

60 km {hr}^{- 1} .

Waves of the ocean is taking ship towards the west with speed

20 km {hr}^{- 1} .

Man start running on the ship with the flag in his hand in north direction with speed

30 km {hr}^{- 1}

and wind is blowing with

50 km {hr}^{- 1}, 37 °

towards south of west then find the direction of a flutter the flag as seen by the man on the ground.

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 29

Three particles

A, B

and

C

are initially at points

(- \frac{3}{2}, 3, 0), (\frac{3}{2}, 3, 0)

and

(0, 3, \frac{3 \sqrt{3}}{2})

respectively. They start their motion at

t = 0

with same constant speed

2 m s^{- 1} .

Particle

A

always heads towards particle

B,

particle

B

heads towards particle

C

and particle

C

heads towards particle

A .

At what time will the particles meet each other.

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-4>Q 30

Two balls are projected from points $A$ and $B$ in a vertical plane as shown in the figure. $A B$ is a straight vertical line. The balls will collide in mid-air if $\frac{V_{1}}{V_{2}}$ is equal to:

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Important Questions on Kinematics

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