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Q.

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 at time ‘t are given by x= 6t and y=8t–5t2. What is the velocity of projection?

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a

8 ms−1

b

10 ms−1

c

14 ms−1

d

6 ms−1

answer is C.

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Detailed Solution

ucos⁡θ=6&usin⁡θ=8

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