A simple pendulum performsSHM in a vertical plane with an amplitude of 5.00cm. At time zero, the bob has a displacement of 5.00cm from its equilibrium position 0.500s later, determine the period of the motion

If football was tossed in air without gravity or friction the ball would go into space

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared.