Question

4.Which of the following situations is possible?

(a) An object can have acceleration, but constant velocity.

(b) The velocity of an object may be zero but acceleration is not zero.

(c) Distance and the magnitude of displacement are equal in circular motion.

(d) Average speed and the magnitude of average velocity are always equal in circular motion.​

Answer 1

Explanation:

(b) The velocity of an object may be zero but acceleration is not zero. I hope answer right hai .

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Answer 2

Answer:

(a).The object can move in a certain path with a perpendicular acceleration, in the case of circular motion. When an object is moving along a circular motion its path is along the circle tangent but the centripetal acceleration is towards the circle radius. We understand that with the radius, a tangent still makes a right angle. So when the object in a circular motion, the velocity and accelerations are in a mutually perpendicular direction.

(b).A car moving with an average speed returns to the initial position

A car moving with an average speed returns to the initial positionSuppose a car covers a distance of 50 m in 5 seconds and comes back to initial position in 5 seconds. The average speed of car is 10 m/s, but average velocity is zero because displacement is zero.

(c).The distance moved and magnitude of displacement are equal only in the case of motion along a straight line. Because displacement is the shortest path between initial and find path. So, for car moving on straight road, distance moved and magnitude of displacement are equal.

(d).If the motion of an object is along a straight line and in the same direction, the magnitude of displacement is equal to the total path length. In that case, the magnitude of the average velocity is equal to the average speed.

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