What is the formula for power when mass, height, and time are known?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
When you know the mass (m), height (h), and time (t), you're calculating gravitational potential power. The formula is:
Power (P) = (m × g × h) / t
Where:
- m = mass in kilograms (kg)
- g = gravitational acceleration (9.8 m/s²)
- h = height in meters (m)
- t = time in seconds (s)
Example: If you lift a 10 kg box to a height of 2 meters in 5 seconds: P = (10 × 9.8 × 2) / 5 = 39.2 watts
This formula helps you understand how much power is required to lift objects against gravity over a specific time period.
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