# Question #8ca42

Nov 23, 2017

Yes. He should apply force equal to his weight.

#### Explanation:

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

4th Question

a) $\text{700 N}$

b) Work = Force × Displacement $= \text{ 700 N × 5 m = 3500 J}$

c) Change in energy$= m g \left({h}_{f} - {h}_{i}\right) = \text{700 N × (5 m - 0 m) = 3500 J}$