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

`8.5` units

10 units

7 units

`7sqrt2` units

Text Solution

Verified by Experts

The correct Answer is:

(d): `vecv=vecu+vecat`
`vecv=(3hati+4hatj)+(0.4hati+0.3hatj)xx10`
`vecv=7hati+7hatj`
`u=sqrt(49+49)=7sqrt2` units

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