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The displacement of a body at any time t...

The displacement of a body at any time t after starting is given by `s=15t-0.4t^2`. Find the time when the velocity of the body will be `7ms^-1`.

A

20 s

B

15 s

C

10 s

D

5 s

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The correct Answer is:
C
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RESONANCE-DAILY PRACTICE PROBLEM-DPP No.3
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