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A man of mass 80kg stands in a lift. If the lift moves upwar...

A man of mass 80kg stands in a lift. If the lift moves upwards with acceleration 0.5ms2, calculate the reaction from the floor of the lift on the man. [g=10ms2]

A.

760N

B.

800N

C.

805N

D.

840N

Correct answer is D

Net force = Upward force - weight

ma=FmgF=ma+mg

F=(80×10)+(80×0.5)=800+40=840N