Question

1. In straight line motion, if a particle is at rest at an instant, then at that instant its acceleration

Must be zero
May be zero
Must be positive
Must be negative
2. When velocity and acceleration of a particle in straight line motion are in same direction, then its speed
Must be increasing
Must be decreasing
May be increasing or decreasing
Must be constant

Answer 1

Step-by-step explanation:

is the particle moving and then suddenly still? if so then the acceleration is relatively negative. It it is just still at an instant, then it is at 0.

2. may be increasing or decreasing. Acceleration does not have to be speeding up, if the velocity and acceleration are in the same direction, the speed can lower or higher.