A) mg
B) mg/2
C) more than 2mg
D) more than mg
Correct Answer: D
Solution :
Let us assume that body is moving upwards with acceleration a. The weight, \[w=mg\]of the body acts downward. At equilibrium, \[R=mg\] Now, when the body starts moving upward,. then we have \[R-mg=ma\] \[\Rightarrow \] \[R=mg+ma\] This shows that an additional force \[(ma)\] is required to lift up the body. Hence, minimum force required is \[(mg+ma)>mg\]You need to login to perform this action.
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