Q1. A bullet of mass 0.90 kg is headed at horizontal speed 60m/s toward a block of mass 13(0.9 kg) = 11.70 kg resting on a horizontal frictionless surface. The bullet strikes the block and comes to rest relative to the block somewhere deeply embedded inside block. What average force did the block exert on bullet if it took 0.020 s to stop the bullet?

Q2. The 2.00 kg object below is released from rest at the height of 5.0 m on a curved frictionless ramp. At the foot of the ramp is a spring of force constant k = 450 N/m. The object slides down the ramp and into the spring, compressing it a distance x before coming momentarily to rest.