An out fielder throws a cricket ball with an initial kinetic energy of `800 J` and an nfielder catches the ball when its kinetic energy is `600J`. If the path of the bal between them is assumed straight and is `20m` long, the air resistance acting on the ball is

When speed of the ball is doubled its kinetic energy is

A ball is thrown with initial energy 100J at an angle theta to the horizontal . If its energy at the top becomes 30 J then angle of projection-

An outfielder throws a baseball with an initial speed of 83.2 mi/h. Just before an infielder catches the ball at the same level, the ball's speed is 110 ft/s. In foot-pounds, by how much is the mechanical energy of the ball-Earth system reduced of air drag ? (The weight of a baseball is 9.0 oz.)

A boy throws a ball of mass 200g with a velocity 20ms^-1 at an angle of 40° with the horizontal. What is the kinetic energy of the ball at the highest point of the trajectory?

When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus ? Explain.

A 5 kg ball is trhown up with a speed of 10 m/s. Find its kinetic energy at the time of throw.

A ball is thrown vertically upwards with a velocity v and an initial kinetic energy E . When half way to the top of its flight, it can have velocity and kinetic energy respectively of :