1. Two cars A and B are travelling in the same direction with velocities VA and VB ( VA >V B) When the car A is at a distance d behind the car B the driver of the car A applies brakes producing a uniform retardation a. There will be no collision when
2. A boy throws a stone upwards from a stationary lift with velocity u m/s which comes back to lift in t1 second. If he throws another stone upward with same velocity u m/s from a lift moving up with constant velocity u/2 m/s and it take a time t2 to reach back to lift. Which of the following correctly represent the relation between t1&t2?
3. Two trains A and B are moving with a velocity of 60 km/h and 40 km/h respectively towards north direction. What is the relative velocity of train B w.r.t. train A
4. A jet airplane travelling at the speed of 500 km h–1 ejects its products of combustion at the speed of 1500 km h–1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground ?
5. A police car running with a speed of 120 km/hr chases a truck running ahead with a speed of 110 km/hr , the relative speed of car with truck is:
6. A lift moves upward with constant acceleration ‘a’. A person in the lift drops an object. If g is acceleration due to gravity , the acceleration of the object with respect to the lift is:
7. A 120 m long train is moving towards west at a speed of 10m/s . A bird, flying towards east at a speed of 5 m/s , crosses the train. What is the time taken by the bird to cross the train?
8. A police van moving on a highway with a speed of 36 km/h fires a bullet at a thief’s car speeding away in the same direction with a speed of 72 km/h . If muzzle speed of the bullet is 150 km/h ,with what speed does the bullet hits the thief’s car?