Question

Q5) For a body moving in a straight line, there can be situation with (1)

A: v=0, a≠0

B: a=0, v≠0

(a) Only A is correct

(b)Only B is correct

(c) Both A and B are correct

(d)Both are incorrect​

Answer 1

Answer:

Only B is correct.

Answer 2

For a body moving in a straight line, there can be situation with (c) Both A and B are correct.

It is given that a body is moving in a straight line.  

Let us consider situation A.   A: v=0, a≠0

In this case, velocity is given zero. While acceleration is non-zero.  

If the direction of the force on the body is changed, then the body will also reverse its direction after moving ahead for some time. The moment when the body will change its direction is the moment when this situation happens.

Let us take an example. If a ball is thrown upwards, then it will start falling down after reaching a particular height. At the highest point where the ball changes its direction, the velocity of the ball is zero. However, acceleration due to gravity still acts on it.

Thus, there can be this situation for a body moving in a straight line.

Let us consider situation B.      B: a=0, v≠0

Here, acceleration is given zero. While velocity is non-zero.

This is the case of uniform motion. If a body traverses at a uniform speed in a straight line, then its acceleration is zero.