# What is the average speed of an object that is moving at #9 m/s# at #t=0# and accelerates at a rate of #a(t) =2t+1# on #t in [1,2]#?

##### 1 Answer

Mar 2, 2018

#### Answer:

The average speed is

#### Explanation:

The speed is the integral of the acceleration

Plugging in the initial conditions

Therefore,

The average speed is