A 10 kg block is raised to a height of 3 m in 6 s against gravity. What is the power delivered by the worker?

Step-by-step solution

1. Step 1: Calculate the work done against gravity: $W=mgh=10\times 10\times 3=300,\text{J}$.
2. Step 2: Power is defined as work done per unit time: $P=\frac{W}{t}$.
3. Step 3: Substitute the values: $P=\frac{300}{6}=50,\text{W}$.
4. Step 4: State that the worker delivers $50,\text{W}$ of power.

Concept tested: Power of a force

Published 1 October 2026 · How this solution was prepared and checked