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A mass of 75kg is placed on a lift. Find the force exerted b...

A mass of 75kg is placed on a lift. Find the force exerted by the floor of the lift on the mass when the lift is moving up with constant velocity. [g=9.8ms2]

A.

750N

B.

745N

C.

735N

D.

98N

Correct answer is C

Net force = Upward force - weight

ma=Fmg

With constant velocity, acceleration = 0, therefore, ma = 0

.