State which of the following situations are possible and give an example of each of these:

(a) A body moving with constant acceleration but with zero velocity.

(b) A body moving horizontally with an acceleration in vertical direction.

(c) A body moving with a constant velocity in an accelerated motion.

Ans. (a) Yes, at the highest point of a body thrown vertically upwards. At the highest point, the body’s velocity is zero but it has an acceleration of 9.8 m s-2 in the downward direction.

(b) Yes, a projectile fired at an angle has a uniform velocity along the horizontal, but its motion along the vertical is uniformly accelerated.

(c) Yes, when a body moves along a circular path with constant speed. In this situation, the speed is constant but due to change in direction the body possesses acceleration.

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