;A 20-N block lifted straight upward by a hand applying a force of 20 N. If the block is lifted 1 m, who much work does the hand do?

force times distance in the direction of the force

= 20 N * 1 meter = 20 Joules

To calculate the work done, we can use the formula:

Work = Force x Distance

Given that the hand is applying a force of 20 N and the block is lifted 1 m, we can substitute these values into the formula:

Work = 20 N x 1 m

Therefore, the work done by the hand is 20 Joules (20 N x 1 m = 20 J).

To find the work done by the hand, we can use the formula:

Work = Force × Distance

In this case, the force applied by the hand is 20 N, and the distance the block is lifted is 1 m. So, substituting these values into the formula we get:

Work = 20 N × 1 m
Work = 20 N·m

Therefore, the hand does 20 N·m (newton-meter) of work in lifting the block.