Motion in a Str...

Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground after 4 seconds. When the first one reaches the ground the distances between the first and second, the second and third and the third and forth will be respectively.

A balloon rises from rest with a constant acceleration g/8. A stone is released from it when it has risen to height h. The time taken by the stone to reach theground is

Two bodies are thrown simultaneously from a towerwith same initial velocity v₀ : one vertically upwards,the other vertically downwards. The distance betweenthe two bodies after time t is

An aeroplane files around a square field ABCD of each side 1000 km. Its speed along AB is 250 km h^–1, along BC 500 km h^–1, along CD 200 km h^–1, and along DA 100 km h^–1. Its average speed (in km h^–1) over the entire trip is

A body moves 6 m north, 8 m east and 10 m vertically upwards, what is its resultant displacement from initial position?

A person moves 30 m north and then 20 m towards east and finally 30√2 m in southwest direction. The displacement of the person from the origin will be

A wheel of radius 1 m rolls forward half a revolution on a horizontal ground. The magnitude of the displacement of the point of the wheel initially in contact with the ground is

A cyclist starts from the centre O of a circular park of radius one kilometre, reaches the edge P of the park, then cycles along the circumferences and returns to the centre along QO as shown in the figure. If the round trip takes ten minutes, the net displacement and average speed of the cyclist (in metre and kilometre per hour) is

The displacement of a body along x-axis depends on time as √x = t + 1. Then, the velocity of body

A body is moving along a straight line path with constant velocity. At an instant of time the distance travelled by it is S and its displacement is D, then