A 3 kg stone falls from a 20m high platform. Find its falling speed at 10 m height.
Correct answer: B. 14 ms-1
- A. 196 ms-1
- B. 14 ms-1
- C. 10 ms-1
- D. 100 ms-1
Explanation
Distance traveled by stone is 10m (so, s=10m), acceleration due to gravity on the stone is g (a=9.81ms-2), and initial velocity of stone is 0m/s (u=0m/s). Based on the available information and values, we can use the following kinematic equation: v² - u²= 2as, where v is the final velocity. v² - (0m/s)² = 2 x 9.8m/s2 x 10m v² = 196m2/s2 √(v²) = √(196) v = 14 m/s
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