# What is the average speed, on #t in [0,5]#, of an object that is moving at #12 m/s# at #t=0# and accelerates at a rate of #a(t) =5-2t# on #t in [0,4]#?

##### 1 Answer

Dec 27, 2015

The average speed is 9.6 m/s

#### Explanation:

You must consider the equations

and divide the total path into two parts, one with acceleration and one without acceleration. You find the total distance and the time elapsed and finally use the equation:

That's all.