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Q1. What is the potential energy of a 2 kg object at a height of 5 m? (Use g = 9.8 m/s²)
Solution:
Potential energy PE = mgh = 2 kg × 9.8 m/s² × 5 m = 98 J.
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Q2. If an object is moving in a circular path with a radius of 10 m and completes one revolution in 20 seconds, what is its speed?
Solution:
Circumference = 2πr = 2π(10 m) = 62.83 m. Speed = distance/time = 62.83 m / 20 s = 3.14 m/s.
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Q3. If a car travels at a constant speed of 60 km/h, how far will it travel in 2 hours?
Solution:
Distance = Speed × Time = 60 km/h × 2 h = 120 km.
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