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Q: A boy standing on top of a 20 meter high tower throws a stone with which velocity of stone hits the ground is? (g = 10 m/s²) –
  • A. 20m/s
  • B. 10m/s
  • C. 15m/s
  • D. 25m/s
Correct Answer: Option A - Since the stone is thrown from a height. There u = 0 from , v² = u²+ 2gh v² = 0 + 2 × 10 × 20 v² = 400 v = 20 m/s
A. Since the stone is thrown from a height. There u = 0 from , v² = u²+ 2gh v² = 0 + 2 × 10 × 20 v² = 400 v = 20 m/s

Explanations:

Since the stone is thrown from a height. There u = 0 from , v² = u²+ 2gh v² = 0 + 2 × 10 × 20 v² = 400 v = 20 m/s