Q2. A body is thrown vertically upwards and rises to a maximum height of 10 m. The velocity with which the body was thrown upwards is: (g = 9.8 m/s²)
a) 10 m/s               b) 14 m/s                 c) 20 m/s                  d) 18 m/s
Q3. A ball of mass 50 kg is moving horizontally with a speed of 20 m/s. A man hits the ball and the ball travels back in the opposite direction with the same speed. If the ball is in contact with the bat for 0.1 s, the force exerted by the  bat on the ball is :
a) 50000 N           b) 10000 N              c) 200000 N             d) 30000 N