A juggler keeps on moving four balls in the air throwing the balls after regular intervals. When one ball leaves his hand `("speed" = 20 ms^-1)` the positions of other balls (height in m) `("Take" g = 10 ms^-2)`.

A boy throws balls into air at regular interval of 2 second. The next ball is thrown when the velocity of first ball is zero. How high do the ball rise above his hand? [Take g=9.8m//s^(2) ]

A player throws a ball upwards with an initial speed of 30 m s^(-1) . How long does the ball take to return to the player's hands? ( Take g = 10 m s^(-2) )

A girl standing on a stationary lift (open from above) throws a ball upwards with initial speed 50 m s^(-1) . The time taken by the ball to return to her hands is (Take g = 10 m s^(-2) )

A person throws balls into the air one after the other at an interval ofone second. The next ball is thrown when the velocityof the ball thrown earlier is zero. To what height the ball rise:

The maximum height attained by a ball projected with speed 20 ms^(-1) at an angle 45^(@) with the horizontal is [take g = 10 ms^(-2) ]

A football is kicked with speed 20 ms^(-1) at a projection angle of 45^@ from the ground. A receiver on the goal line 20 m away in the disrection of the kich runs the same instant to meet the ball. What must he his speed, of he is to catch the ball cefore it hits the ground ? Take g= 10 ms^(-2) .

A ball is projected horizontallu from a top of tower with a velocity of 10 ms^(-1) . Find the velocity of the ball after 0.5 s. Take g= 10 ms^(-2) .

A ball projected upwards from the foot of a tower. The ball crosses the top of the tower twice after an interval of 6 s and the ball reaches the ground after 12 s . The height of the tower is (g = 10 m//s^2) :