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A body is projected with an initial spee...

A body is projected with an initial speed of `100sqrt3ms^(-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.

A

`a,b,c` and `d` are correct

B

only `a,c` and `d` are correct

C

only `b,c` and `d` are correct

D

only `a,b` and `d` are correct

Text Solution

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The correct Answer is:
A
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