A particle has an initial velocity of 4 ...

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

A

7 units

B

`7 sqrt(2)` units

C

8.5 units

D

10 units

Text Solution

Verified by Experts

The correct Answer is:

B

`vecv =vecu+vecat=(3hati+4hatj)+(0.4hati + 0.3 hatj ) (10)`
`=7hati +7hatj`
so speed `= |vecv|=7sqrt(2)ms^(-1)`

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