Physics
Grade-7
Easy
Question
A roller coaster is at the top of a 72 m hill and weighs 966 N. The coaster comes down at a speed of 10 m/s. What is its kinetic energy?
- 4928.6 J
- 5000 J
- 4000 J
- 48.3 KJ
Hint:
4928.6 J
The correct answer is: 4928.6 J
m = 
kg
v = 10 m/s
KE = 
mv2
= 4928.6 J
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