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A particle has an initial velocity 3hati...

A particle has an initial velocity `3hati+4hatj` and an accleration of `0.4hati+0.3hatj`. Its speed after 10s is

A

7 units

B

8.5 units

C

10 units

D

`7sqrt2` units

Text Solution

Verified by Experts

The correct Answer is:
D
(d): `hatu=3hati+4hatj, hata=0.4hati+0.3hatj`
`vecu=vecu+veca t`
`=(3hati+5hatj)+(0.4hatj+0.3hatj)10`
`vecu=7hati+7hatj`
`v=sqrt(7^(2)+7^(2))=7sqrt2` unit
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