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A particle has an initial velocity `(6hati+8hatj) ms^(-1)` and an acceleration of `(0.8hati+0.6hatj)ms^(-2)`. Its speed after 10s is

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A particle has an initial velocity `(6hati+8hatj) ms^(-1)` and an acceleration of `(0.8hati+0.6hatj)ms^(-2)`. Its speed after 10s is
A. 10 units
B. 7 units
C. `7 sqrt(2)` units
D. 8.5 units
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Correct Answer - C
`vecv=vecu+vecat=(3hati+4hatj)+(0.4hati+0.3hatj)(10)`
`=7hati+7hatj`
So speed `=|vecv|=7 sqrt(2) ms^(-1)`
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