Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 4 - Work And Energy

Question 35 Exercise

A man drops a 10 kg rock from the top of a 5m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground?


Mass of rock = 10 kg

Height of ladder, h = 5m

Initial velocity of rock, u = 0

Final velocity, v

g = 10 m/s2

Using the third equation of motion


v = 10 m/s

KE = 1/2 mv2 = 500J

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