Numerical: 1. A ball of mass 0.2kg falls from a height of 45m. on striking the ground it rebounds in 0.1 sec

with two third of the velocity with which it struck the ground. Calculate (i) the momentum

change on hitting the ground, (ii) the force on the ball due to the impact.

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.