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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 0.5\(ms^{-2}\), calculate the reaction from the floor of the lift on the man. \([g = 10ms^{-2}]\)

A.

760N

B.

800N

C.

805N

D.

840N

Correct answer is D

\(\text{Net force = Upward force - weight}\)

\(ma = F - mg  \implies F = ma + mg \)

\(F = (80 \times 10) + (80 \times 0.5) = 800 + 40 = 840N\)