An open lift is coming down from the top of building at a constant speed `v=10m//s`. A boy standing on the lift throws a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:

A ball is thrown downwards with a speed of 20 m s^(-1) , from the top of a building 150 m high and simultaneously another ball is thrown vertically upwards with a speed of 30 m s^(-1) from the foot to the building . Find the time after which both the balls will meet. (g=10 m s^(-2)) .

How much power is needed to lift a 75- kg student vertically upward at a constant speed of 0.33 m/s ?

A stone of 200g is thrown vertically upward at a velocity of 60m/s. The kientic energy of the stone after 7s will be (g= 10m//s^(2))

A stone is dropped from the top of building and at the same time a second stone is thrown vertically upward from the bottom of the building with a speed of 20 m s^(-1) . They pass each other 3 seconds later. Find the height of the building

Lift travels in straight line at a constant speed of 3 cc 10^(8) m//s. What is the acceleration of lift ?

A stone is dropped from the top of a 400 m high tower. At the same time another stone is projected vertically upwards from the ground with a speed of 50 m//s . The two stones will cross each other after a time

A stone is released from the top of a tower 90m high. At the same instant a second stone is projected vertically upwards from the ground with a velocity of 30 m//s . When and where will the two stones meet?

A stone is shot straight upward with a speed of 20 m/s from a tower 200 m high. The speed with which it strikes the ground is (g=10 m/s^2)