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  • A projectile fired at to the ground is observed to be at same height at time <img alt="\mathrm{3s\: and\: 5s

A projectile fired at 30^{0} to the ground is observed to be at same height at time \mathrm{3s\: and\: 5s } after projection, during its flight. The speed of projection of the projectile is ________\mathrm{ ms^{-1}}.
(Given \mathrm{ g = 10 ms^{-2}})
 

Option: 1

80


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

Time of Flight =5+3=8\: \mathrm{sec}

Now,\mathrm{T=\frac{2u\sin \Theta }{g}}

\mathrm{8=\frac{2u.\sin 30^{0}}{10}}

\mathrm{\Rightarrow u=80\: m/sec}

Posted by

Ritika Jonwal

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