If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

(1) constant speed

(2) constant velocity

(3) constant acceleration

(4) varying acceleration

**Answer: **(3) In this case the given equation shows that that the velocity is linear with time and therefore the particle is moving with constant acceleration because for a particle to acquire constant acceleration the graph of the velocity-time graph should be in linear with the time function.