Aweightlifter deadlifts a 300 kg weight. if the weightlifter has a mass of 100 kg, what is the force acting on his legs?

3920 N

Explanation:

The force acting on his legs is equal to the resultant total force on his body I.e his weight plus the mass he's carrying.

M = m1 + m2

M1 = mass of the weight lifter

M2 = mass of the weight he's carrying

M = sum of the total mass acting on body

M = (100 + 300) kg

M = 400kg

But force = mass * acceleration due to gravity,

Force (f) = 400 * 9.8

F = 3920N

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the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this