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A body is projected with an initial spee...

A body is projected with an initial speed of `100 sqrt(3) ms^(-1)` at an angle of `60^(@)` above the horizontal. If `g = 10ms^(-2)` then velocity of the projectile
(a) Is perpendicular to it's acceleration at the instant t = 15 sec.
(b) Is perpendicular to initial velocity of projection at t = 20 sec.
(c) Is minimum at the highest point
(d) Changes both in magnitude and direction, during its flight.
Mark the answer as.

A

If a, b, c and d are correct

B

If a, c and d are correct

C

If b, c and d are correct

D

If a, b and d are correct

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The correct Answer is:
A
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