2. (2 pts.) A car hits another car and the bumpers lock together during the coll

Question

2. (2 pts.) A car hits another car and the bumpers lock together during the collision. Is this an clastic or an inelastic collision? a) b) c) elastic inelastic insufficient information (it could be either) 3. (2 pts.) A leaf falls from a tree. Compare its kinetic energy KE to its potential energy PE a) b) c) d) e) KE increases and PE decreases KE decreases and PE increases KE decreases and PE decreases KE increases and PE increases KE and PE remain constant 4. (2 pts.) A ball has a speed of 15 m/s.Only one external force acts on the ball. After this foree acts, the speed of the ball is 7 m/s. Has the force done a. positive, b. zero, or c. negative work on the ball? followine statements concerning the momentum of a system when

Explanation / Answer

Question-2 answer will be inelastic.

Question-3 answer will be KE increases and potential energy decreases

Question-4 negative work because change in KE is negative which is equal to work done by force.

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