The point from where a ball is projected is taken as the origin of the coordinate axes. The x and y components of its displacement are given by x = 6t and y = 8t - 5t2 . What is the velocity of projection?

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6 ms-1

8 ms-1

10 ms-1

14 ms-1

answer is C.

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Detailed Solution

vx = dxdt = 6 and vy = dydt = 8-10t = 8-10×0 = 8 v = vx2+vy2 = 62+82 = 10 ms-1

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