Answer:
4 metres
Explanation:
when object is in air, the only energy it has is gravitational potential energy, provided air drag is negligible
so mgh = energy = 640 J
640 = 16 × 10 × h
on solving, h = 4 metres above the ground
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Verified answer
Answer:
4 metres
Explanation:
when object is in air, the only energy it has is gravitational potential energy, provided air drag is negligible
so mgh = energy = 640 J
640 = 16 × 10 × h
on solving, h = 4 metres above the ground