A 10-N Toy Rocket Blasts Straight Up from Ground Level

A 10-N toy rocket blasts straight up from ground level with an initial kinetic energy of 40 J.At the exact top of its trajectory,the total mechanical energy of the rocket-Earth system is 140 J.To what vertical height above the ground does it rise,assuming no air resistance?

A) 1.0 m
B) 10 m
C) 14 m
D) 24 m

Correct Answer:

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