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]
- 40 N
- 80 N
-
120 N
- 160 N
The correct answer is: C
Explanation
W = Mg
man's weight = 80N then his mass = \(\frac{80}{10}\) = 8kg
T = Mg + Ma = M( g + a) = 8(10 + 5) = 8 x 15 = 120N.