Question

If a particle is moving along straight line with increasing speed, then 1)its acc is negative 2) its acc may be decreasin 3) its acc is positive

Answer 1

If a particle is moving along a straight line with increasing speed then its acceleration is positive.

The reason for its acceleration being positive is because the velocity with which it is moving is positive.

When a body is moving in a straight line with increasing speed, then it signifies that the velocity in result is also increasing with constantly.

Answer 2

Ans is b,

It is because in 2nd they are saying MAY BE, therefore it might not true and can be false. We can't tell a to be +/- with its speed.

Hope it helps.