JEE Mains · Physics · STD 11 - 3.2 motion in plane
A child stands on the edge of the cliff \(10\,m\) above the ground and throws a stone horizontally with an initial speed of \(5\,ms ^{-1}\). Neglecting the air resistance, the speed with which the stone hits the ground will be \(..........ms ^{-1}\) (given, \(g =10\,ms ^{-2}\))
- A \(20\)
- B \(15\)
- C \(30\)
- D \(25\)
Answer & Solution
Correct Answer
(B) \(15\)
Step-by-step Solution
Detailed explanation
\(v _{ y }=\sqrt{2 g h}=\sqrt{200}\) \(v_{\text {net }}=\sqrt{25+200}=15\,m / s\)
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