Calculate the force a mother must exert to hold her 12.0 kg child in an elevator

Question

Calculate the force a mother must exert to hold her 12.0kg child in an elevator under the following conditions.

A) The elevator accelerates upward at 0.850 m/s2.

- calculate the force in newton

- calculate the ratio of this force to the weight of the child
1

2    

(b) The elevator moves upward at a constant speed.
-calculate the force in newton

- calculate the ratio of this force to the weight of the child
4

(c) The upward bound elevator decelerates at 2.30 m/s2.
-calculate the force in newton

- calculate the ratio of this force to the weight of the child

PLEASE SHOW WORK!!

Explanation / Answer

1. 12kg * (9.81 + 0.85) =127.92 N

2. 12kg * (9.81) = 117.72 N

3. 12kg * (9.81-2.3) = 90.12 N

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