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the displacment of a particle long x-axi...

the displacment of a particle long x-axis is given by `x=7t^(2)+8t+3` . Its acceleratiton anf velocity at `t=2s` respectively….

A

`36ms^(-1),14ms^(-2)`

B

`14ms^(-2), 36ms^(-1)` .

C

`47ms^(-2), 21ms^(-1)`

D

`2ms^(-1), 47ms^(-2)` .

Text Solution

Verified by Experts

The correct Answer is:
B
`x=7t^(2)+8t+3`
`V=(dx)/(dt)=14t+8, at t=2s, V=36ms^(=1)`
`a=(dv)/(dt)=14ms^(-2)`
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