# Please tell me how to solve it?

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#16t^2

#16t^2

##### 1 Answer

Sep 3, 2017

(a)

(b)

#### Explanation:

Average speed is given by:

#barv=(Deltax)/(Deltat)#

Here,

#barv=(s(5)-s(0))/(5-0)# #"ft/sec"#

#color(white)barv=(16*25-16*0)/5# #"ft/sec"#

#color(white)barv=80# #"ft/sec"#

To find the instantaneous velocity at

#v=(ds)/dt=d/dt16t^2=32t#

Thus, at

#v=32*5=160# #"ft/sec"#