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Question

A fire extinguishing hose pipe disposes watch at a speed of 10 m/s to put off fire on a building. Assuming safe distance from the building on ground is 5 m, What is the maximum height at which water strikes building?

A
1.75 m
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B
2.5 m
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C
3.75 m
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D
4.75 m
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Solution

The correct option is B 2.5 m
Range R=5×2=10m
R=u2sin2θg where u=10m/s
10=100×sin2θ10
sin2θ=1
θ=45
H=u2sin2θ2g=100×(1/2)2×10
=2.5m

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