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Q.

A projectile is thrown horizontally with a speed of 20ms−1from certain height. If g is 10ms−2,then the speed of the projectile after 5 second will be nearly

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a

0.5ms−1

b

5ms−1

c

54ms−1

d

500ms−1

answer is C.

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Detailed Solution

Even after 5 second, the horizontal velocity Vxwill be 20ms−1. The vertical velocity Vy is given by Vy=0+10×5=50ms−1 Now, V=Vx2+Vy2=202+502=54ms−1
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A projectile is thrown horizontally with a speed of 20ms−1from certain height. If g is 10ms−2,then the speed of the projectile after 5 second will be nearly