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Question

Question: A girl after being angry throws here engagement ring from the top of a building 12 m high towards he...

A girl after being angry throws here engagement ring from the top of a building 12 m high towards her boy friend with an initial horizontal speed of 5 ms-1, speed with which the ring it touches the ground is

A

5 ms-1

B

14.3 ms-1

C

1.5 ms-1

D

16.2 ms-1

Answer

16.2 ms-1

Explanation

Solution

vy2 = 2ay = 2 × 10 × 12

v = 25+240\sqrt{25 + 240} = 16.2 ms-1.