Q.

The displacement of a body at any time t after starting is given by s = 15t – 0.4t2 . The velocity of the body will be 7 ms–1 after time:

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a

20 s

b

15 s

c

10 s

d

5 s

answer is C.

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Detailed Solution

v=dsdt=15-0.8t Put v=7ms-1 ⇒t=10s
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