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A particle has an initial velocity of 3h...

A particle has an initial velocity of `3hat(i) + 4 hat(j)` and an acceleration of `0.4 hat(i) + 0.3 hat(j)`. Its speed after `10s ` is :

A

10unit

B

`7sqrt(2)unit 7 unit

C

7unit

D

8.5unit

Text Solution

Verified by Experts

The correct Answer is:
b
`vecv=vecu+vecat`
`vecv=(3hati+4hatj)+(0.4hati+hatj)xx10`
`vecv=7hati+7hatj`
`|vecv|=sqrt((7)^(2)+(7)^(@))=7sqrt(2)` unit.
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