1. A cart moving at 35.00 m/s is brought to a stop by the force plotted in the force-time graph shown here. What is the impulse and the approximate mass of the cart.
2. A 9.0 kg rock starting from rest free-falls through a distance of 50.0 m. Assuming no air resistance, What is the amount of momentum that is transferred from the rock to earth as it collides with earth's surface. What is the change in velocity of earth as a result of this momentum change? The earth's mass is 60 x 10^24, and is a closed system.