1. Which could potentially cause you the greater injury; being tackled with a light-weight, fast-moving football player, or being tackled by a player with double the mass however moving at half the speed?
2. For each situation, state whether the collision is elastic or inelastic. If it is inelastic, state whether it is totally inelastic or not?
a) You drop a ball from your hand. It collides by the floor and bounces back up so that it just reaches your hand.
b) You drop a dissimilar ball from your hand and let it collide with the ground. This ball bounces back up to half the height from which it was dropped.
c) You drop a ball of clay from your hand. When it collides with the ground, it stops.
3. Will the centre of mass in continue on the same parabolic trajectory even after one of the fragments hits the ground? Why or why not
4. a) If a rocket in gravity- free outer space has the same thrust at all times, is its acceleration constant, decreasing or increasing?
b) If the rocket has the same acceleration at all times, is the thrust constant, decreasing or increasing?