A boy of height 4 ft walking horizontally with a uniform velocity of 2m/s passes under a bulb which is at a height of 12ft above the ground.The velocity of edge of the shadow of the boy's head (in m/s) is?

A body is dropped from a balloon moving up with a velocity of 4 m//s , when the balloon is at a height of 120 m from the ground. The height of the body after 5 s from the ground is:

If velocity of flow is 4 m/s, then velocity head is

A balloon was moving upwards with a uniform velocity of 10 m/s. An object of finite mass is dropped from the balloon when it was at a height of 75 m from the ground level. The height of the balloon from the ground when object strikes the ground was around : (takes the value of gas 10 m//s^2)

A ball of mass 2 kg is projected horizontally with a velocity 20m/s from a building of height 15m. The speed with which body hits the ground is :

man of height h walks in a straight path towards a lamp post of height H with uniform velocity u. Then the velocity of the edge of the shadow on the ground will be :-

A girl of height 90cm is walking away from the base of a lamp-post at a speed of 1.2m/s . If the lamp is 3.6m above the ground,find the length of her shadow after 4 seconds.