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- 1. Multiple Choice
A racing car has a mass of 1525 kg. What is its kinetic energy if it has a speed of 108 km/h?
8.89 x 10^5 j
6.68 x 10^5 j
1.04 x 10^8 j
4.25 x 10^2 j
- 2. Multiple Choice
Katia and Angela each has a mass of 45 kg and are moving together with a speed of 10.0 m/s.
What is their combined kinetic energy?
4.05 x 10^5 j
405,000 j
4.5 x 10^3 j
2.36 x 10^3 j
- 3. Multiple Choice
Pam has a mass of 45 kg. Her rocket pack supplies a constant force for 22.0 m, and Pam acquires a speed of 62.0 m/s as she moves on frictionless ice. What magnitude of force did the rocket pack apply?
8.6 x 10^4 n
3.9 x 10^3 n
1.89 x 10^3 n
1.89 x 10^5 n
- 4. Multiple Choice
Which marble will hit first?
Jen's marble
Debra's marble
Greg's marble
no one, it will be a tie
- 5. Multiple Choice
A circus performer juggles four identical balls. The performer throws each ball upward with the same initial velocity and releases each ball at the same height. The ball with the greatest kinetic energy will be the ball that the juggler
throws upward, just after it leaves her hand.
is watching, just as it reaches its highest point.
is about to catch, just before it lands in her hand.
does not catch, just before it lands on the floor.
- 6. Multiple Choice
A 2.00×103-kg car has a speed of 12.0 m/s when it hits a tree. The tree doesn’t move, and the car comes to rest, as shown. What work did the tree do on the car?
2.88 x 10^8 j
-1.44 x 10^5 j
2.88 x 10^6 j
4.35 x 10^5 j
- 7. Multiple Choice
An 0.80-kg cart rolls down a frictionless hill of height 0.32 m. At the bottom of the hill, the cart rolls on a flat surface, which exerts a frictional force of 2.0 N on the cart. How far does the cart roll on the flat surface before it comes to a stop?
2.0 m
0.23 m
1.3 m
0.32 m
- 8. Multiple Choice
A science museum display about energy has a small engine that pulls on a rope to lift a block 1.00 m. The display indicates that 1.00 J of work is done. What is the mass of the block?
10 kg
1 kg
9.8 kg
0.10 kg
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