A particle in one-dimensional motion:
1. | with zero speed at an instant may have non-zero acceleration at that instant. |
2. | with zero speed may have non-zero velocity. |
3. | with constant speed, must have non-zero acceleration. |
4. | with a positive value of acceleration must be speeding up. |
The figure gives a speed-time graph of a particle in motion along the same direction. Three equal intervals of time are shown. In which interval is the average acceleration greatest in magnitude?
1. | Interval 2 | 2. | Interval 1 |
3. | Interval 3 | 4. | Equal in all intervals |