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A particle has initial velocity (5hati+7...

A particle has initial velocity `(5hati+7hatj)` and acceleration `(0.7hati+0.5hatj)`. The magnitude of velocity after 10 second will be

Text Solution

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The correct Answer is:
B
`y=sqrt(3)x-2x^(2)`
Trajectory equation is `y=x tan theta-(gx^(2))/(2u^(2) cos^(2) theta)`
`tan theta=sqrt(3)rArr theta=60^(@)` & `(g)/(2u^(2)cos^(2) theta)=2`
`rArr u=5/(2xx1/4)=sqrt(10)`
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