Answer:
Correct answer: F = 50 N weight of backpack
Explanation:
Given:
W = 200 J work against gravity
h = 4 m
F = m g = ?
g = 10 m/s²
The work done is a measure of change in this case of potential energy
W = Δ Ep = m g h = F · h ⇒ F = W / h =
F = W / h = 200 / 4 = 50 N
F = 50 N
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