Question

What force F must be needed to lift the 44.5-kg block at constant velocity?(a) 22.3 N(b) 44.5 N(c) 218 N(d) 437 N

Answer 1

Given,

Mass of the block, m= 44.5 kg

To lift the block at a constant velocity, i.e. with zero acceleration, the net force acting on the body must be zero.

In other words, downward weight acting on the body must be equal to the upward force applied on the body.

i.e.

`F=W=mg`

Where g is the acceleration due to gravity.

Therefore the force F is,

`F=44.5*9.8=436.1\approx437\text{ N}`

Therefore the force that is needed to lift the 44.5 kg block with the constant speed is 437 N