Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 162

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A student is standing at a distance of $50 m$ from the bus. As soon as the bus begins its motion with an acceleration of $1 {m s}^{- 2},$ the students starts running towards the bus with a uniform velocity $u .$ Assuming the motion to be along a straight road, the minimum value of $u,$ so that the student is able to catch the bus is

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Important Questions on Kinematics

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 163

A man throws balls with the same speed vertically upwards one after the other at an interval of

2 s

. What should be the speed of throw so that more than two balls are in the sky at any time? (Given

g = 9 \cdot 8 m s^{- 2}

)

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 164

A ball is thrown vertically upward. It has a speed of

10 m s^{- 1}

when it has reached one half of its maximum height. How high does the ball rise? Take

g = 10 m s^{- 2}

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 165

Two bodies

A

(of mass

1 kg

) and

B

(of mass

3 kg

) are dropped from a height of

16 m

and

25 m

respectively. The ratio of the time taken by them to reach the ground is

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 166

The distance travelled by a particle starting from rest and moving with an acceleration

\frac{4}{3} m s^{- 2}

in the third second is:

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 167

If a ball is thrown vertically upwards at

40 m s^{- 1},

its velocity after two seconds will be

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 168

A body

A

starts from rest with an acceleration

a_{1}

. After

2 seconds

, another body

B

starts from rest with an acceleration

a_{2}

. If they travel equal distances in the

5^{t h} second

, after the start of

A

, then the ratio

a_{1} : a_{2}

is equal to

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 169

A parachutist after bailing out falls

50 m

without friction. When the parachute opens, it decelerates at

2 m s^{- 2}

.He reaches the ground with a speed of

3 m s^{- 1}

. At what height did he bail out?

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-1>Q 170

A car is moving with a speed of

50 km h^{- 1}

, can be stopped by brakes after at least

6 m

. If the same car is moving at a speed of

100 km h^{- 1}

the minimum stopping distance is :-