About Golf Balls

Shark849 asked:


1. A moving car has kinetic energy. If it speeds up until it is going four times faster than before, how much kinetic energy does it have in comparison?
(1) Four times larger
(2) Sixteen times larger
(3) The same
(4) Four times smaller
(5) Sixteen times smaller
(6) The mass is needed.

I think the answer is (6).

2. (a) If a golf ball and a ping-pong ball both move with the same kinetic energy, which has the greater speed?
(1) Cannot be determined
(2) the ping-pong ball
(3) The two balls have the same speed.
(4) the golf ball
(b) In a gaseous mixture of massive molecules and light molecules with the same average KE (kinetic energy), which have the greater speed?
(1) They have the same speed.
(2) the light molecules
(3) the massive molecules
(4) Cannot be determined

I think for [1a] it is (1). I think for [1b] it is (4).

3. A car is lifted a vertical distance in a service station and therefore has potential energy relative to the floor. If it were lifted twice as high, how much potential energy would it have?
(1) Twice as much
(2) The same
(3) Unable to determine
(4) One half as much

I think the answer is (1).

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