Motion in a Str...

A body travelling with uniform acceleration crosses two points A and B with velocities 20 ms^–1 and 30 ms^–1 respectively. The speed of the body at the mid-point of A and B is nearest to

A body moves with initial velocity 10 ms^–1. If it covers a distance of 20 m is 2s, then acceleration of the body is

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

A boat is rent across a river with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr, then velocity of the river is

A train is moving slowly on a straight track with a constant speed of 2 ms^–1. A passenger in that train starts walking at a steady speed of 2 ms^–1 to the back of the train in the opposite direction of the motion of the train. So to an observer standing on the platform directly in front of that passenger, the velocity of the passenger appears to be

The distance between two particles moving towards each other is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separation increase at the rate of 5 m/sec. The particles have speeds as

A boat moves with a speed of 5 km/hr relative to water in a river flowing with a speed of 3 km/hr and having a width of 1 km.The minimum time taken around a round trip is

For a body moving the relativistic speed, if the velocity is doubled, then