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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