Question #8ca42

1 Answer
Junaid Mirza
Nov 23, 2017

Yes. He should apply force equal to his weight.

Explanation:

However if he apply force more than "700 N" then he we will be lifting himself up without constant speed. He will be moving upwards with constant acceleration.

4th Question

a) "700 N"

b) Work = Force × Displacement =" 700 N × 5 m = 3500 J"

c) Change in energy = mg(h_f - h_i) = "700 N × (5 m - 0 m) = 3500 J"

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