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Question

The displacement is given by x=2t2+t+5 in m, the acceleration at t=5s will be

A
8 m/s2
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B
12 m/s2
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C
15 m/s2
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D
4 m/s2
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Solution

The correct option is D 4 m/s2
As we know that a=d2xdt2
Given, x=2t2+t+5dxdt=4t+1d2xdt2=4
a=(d2xdt2)t=5 s=4 m/s2

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