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The instant of time at which acceleratio...

The instant of time at which acceleration and velocity are perpendicular is :-

A

0.6 sec

B

1.2 sec

C

2.4 sec

D

None of this

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Verified by Experts

The correct Answer is:
B

The question can be reframed as shown in figure. The path of particle is parabolic.
`therefore vec(a) _|_ vec(v)` ar maximum height, that is at half time of flight.
Hence `t_(0)=(u sin theta)/(a)=(20xx3//5)/(10)=1.2` sec.
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