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A particle moves in east direction with ...

A particle moves in east direction with 15m/sec for 2 sec then moves in northward with 5 m/s for 8 sec. A average speed of the particle is :-

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The correct Answer is:
B, C
`vec(v)(t)=(3-1xxt)hat(i)+(0-0.5t)hat(j)` …(i)
For maximum positive x coordinate when `v_(x)` becomes zero
`:. 3-t=0 rArrt=3` sec
then `vec(r)(3)=4.5hat(i)-2.25 hat(j)`
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ALLEN -MOTION IN A PALNE-EXERCISE-02
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