With what velocity a body has to be thrown up so that it can rise up to a height of 10 metres from the ground? How much time will fake to reach the highest point?

A body is allowed to fall from a height of 20 metres from the ground. How much time will take to reach the ground? What will be its velocity just a moment before hitting the ground?

A cricket ball is vertically thrown up with a velocity 20 m/s. If the acceleration' - in the opposite direction is 10 m//s^2 , how high will the ball rise? What time will it take to reach the maximum height?

A stone is thrown in a vertically upward direction with a velocity of 5 m s^1 . If the acceleration of the stone during its motion is 10m s^-2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?

A mail bag is dropped into a post office, from an areoplane flying horizontally with a velocity 72hm/hr at height of 490m from the ground. How far must the plane be from the post office so that it may directly fall into the post office ?

A stone is thrown up with a velocity of 20 m/s. Neglecting air resistance calculate the time it will take to return to the ground.

A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms^-2 , with what velocity will it strike the ground? After what time will it strike the ground?

A stone is thrown up with a velocity of 20 m/s. Neglecting air resistance calculate the height that the stone will reach

A body is released from the top of a tower of height h meters. It takes t seconds to reach the ground. Where is the body at time t/2 seconds?

A balloon ascending at the rate of 9.8 ms^(-1) is at a height of 39.2 m above the ground when a packet is dropped from the baloon. After how much time and with what velocity does it reach the ground? g= 9.8 ms^(-2) .

A person trying to lose weight (dieter) lifts a 10 kg mass, one , thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated, (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 xx 10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?