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Two trains $A$ and $B$ , which are $100 km$ apart, are travelling towards each other on different tracks with each having an initial speed of $50 km h^{- 1}$ . The train $A$ accelerates at $20 km h^{- 2}$ and the train $B$ retards at the rate of $20 km h^{- 2}$ . The distance covered by train $A$ when they cross each other is

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Important Questions on Kinematics

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 114

A jet airplane traveling from east to west at a speed of

500 km h^{- 1}

ejects outgases of combustion at a speed of

1500 km h^{- 1}

with respect to the jet plane. What is the velocity of the gases with respect to an observer on the ground?

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 115

A helicopter is flying south with a speed of

50 km h^{- 1}

. A train is moving at the same speed towards the east. The relative velocity of the helicopter as seen by the passengers in the train will be towards

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 116

Two particles are moving with velocities

v_{1}

and

v_{2}

. Their relative velocity is maximum when the angle between their velocities is

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 117

A ship is traveling due east at

10 km h^{- 1}

. A ship heading

30 °

east of north is always due north from the first ship. The speed of the second ship in

km h^{- 1}

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 118

A boat, which has a speed of

5 km h^{- 1}

in still water, crosses a river of width

1 km

along the shortest possible path in

15 minutes

. The velocity of the river water in

km h^{- 1}

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 119

A boat is rowed across a river (perpendicular to the river flow) at the rate of

9 km {hr}^{- 1}

. The river flows at the rate of

12 km {hr}^{- 1}

. The velocity of the boat in

km {hr}^{- 1}

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 120

A boat that can move with a speed of

5 m s^{- 1}

relative to the water crosses a river of width

480 m

flowing with a constant speed of

4 m s^{- 1}

. What is the time taken by the boat to cross the river along the shortest path?

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 121

An airplane pilot sets a compass course due west and maintains an airspeed of

240 km h^{- 1}

. After flying for

\frac{1}{2} h

, he finds himself over a town that is

150 km

west and

40 km

south of his starting point. The wind velocity (with respect to ground) is

Two trains A and B, which are 100 km apart, are travelling towards each other on different tracks with each having an initial speed of 50 km h-1. The train A accelerates at 20 km h-2 and the train B retards at the rate of 20 km h-2. The distance covered by train A when they cross each other is

Important Questions on Kinematics

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