First slide

Projection Under uniform Acceleration

Question

In a projectile motion the velocity
a) is always perpendicular to the acceleration
b) is not always perpendicular to the acceleration
c) is perpendicular to the acceleration for one instant only
d) is perpendicular to the acceleration for two instants.

Easy

A

a & b are correct
B

b & c are correct
C

c & d are correct
D

a & d are correct

Solution

Acceleration of projectile is vertically downward. Velocity of a projectile (for oblique projection) is horizontal only at the highest position.
So Statement -(b) is correct and Statement - (c) is correct

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