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A particle is fired from the ground at s...

A particle is fired from the ground at some angle `(theta ne 90^(@))` and it returns to the ground after some time . Select the correct option (s)

A

Acceleration and velocity becomes perpendicular to each other once .

B

Direction of acceleration during first half of motion is upwards and during second half of motion it is downwards .

C

Angle between the velocity and acceleration during the first half of motion is greater than `90^(@)` and during the second half of motion the same is less than `90^(@)`.

D

Acceleration remains constant .

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
(a,c,d): At the highest point of journey velocity becomes horizontal and hence perpendicular to the acceleration due to gravity . Option (a) is correct .
During the motion, acceleration remains contant and is equal to acceleration due to gravity , hence option (b) is work and (d) is correct
During the first half of motion, velocity of the particle is directed above the horizontal and during the second half, velocity of the particle is directed below the horizontal, hence we can understand that option (c) is also correct .
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