A body weighing 80N stands in an elevator that is about to move. The force...
PHYSICS
JAMB 2002
A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms-2 is [g = 10ms-2]
- A. 40 N
- B. 80 N
- C. 120 N
- D. 160 N
Correct Answer: C. 120 N
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The answer is d
F=ma
M=80/10
=8kg
F=mg+mg=(M+m)a
Then u sub the numbers to find M
Then the f=(M+m)a
= 160N