E. Numerical questions.
1. A car and a bus moving at the same speed. Which has more KE and why?
2. A boy weighs 60 Kg and he runs at a speed of 3 m/s. What is his KE? (Ans: 270 J)
3. If the KE of a ball is 200 J and if it has a mass of 1kg, what will be its speed? (Ans: 20 m/s)
4. What is the PE of a 2 kg rock sitting on a hill which is 20 m high? (Ans: 400 J)
Answers
Answered by
1
Answer:
1. Bus has more kinetic energy because it's mass is greater than the mass of car.
2.
Answered by
2
Explanation:
1) The formula of K.E. (1/2mv^2) itself states that the object having more mass will have more kinetic energy as kinetic energy is directly proportional to mass
2) 1/2×60×3^2
=1×30×9
=270m/s
Similar questions