Physics
Grade-7
Easy
Question
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage comes down with a speed of 5 m/s. What is the kinetic energy of the carriage?
- 75 J
- 3 J
- 15 J
- 6 J
Hint:
15 J
The correct answer is: 15 J
m =
kg
v = 5 m/s
KE =
mv2
![equals space 1 half space cross times space fraction numerator 12 over denominator 9.8 end fraction space cross times space left parenthesis 5 right parenthesis squared](data:image/png;base64,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)
= 15.306 J
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