6. How much force is required to stop a 60 kg person traveling at 30 m/s during a time of
a) 5.0 seconds
b) 0.50 seconds
C) 0.05 seconds

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.