Question

If velocity - time graph has positive slope, then body has ______

1) negative acceleration 

2) positive acceleration 

3) zero acceleration 

4) both (1) and (2)

Answer 1

Correct option is 2) positive acceleration 

The graph says that the velocity is decreasing with time. Now, slope of the velocity-time graph gives acceleration.

Hence acceleration is the rate of change of velocity. Since velocity is decreasing,

Hence acceleration is also negative. Now, the negative acceleration is also called retardation

Since the slope is constant, hence the body has uniform retardation. hence positive acceleration is correct.