Answer to Question #196530 in Physics for Mr. Lee

Question

A block of bricks is raised vertically to a bricklayer at the top of a wall using a pulley system. If the block of bricks has a mass of 24 kg, what is its weight? It is raised 3.0 m. Calculate its increase in gravitational potential energy when it reaches the top of the wall.

Answer 1

1. $W=mg=24\cdot9.8=235.2\ (N)$

2. $PE=mgh=24\cdot9.8\cdot3=705.6\ (N)$