Question

A motor powers a model car so that after starting

from rest, the car travels s inches in t seconds,
where s = 16t\t. Which of the following gives the
average speed of the car, in inches per second, over
the first t seconds after it starts?

Answer 1

B) 16√t

Average speed of the car =16√t inches per second

Explanation:

A) 4√t

B) 16√t

C) 16 / √t

D) 16t

Speed = distance / time

Distance = 16t√t

Time = t

Substitute the value of distance and time into the formula

Speed = distance / time

Speed = 16t√t / t

= 16√t

Therefore, speed = 16√t

Average speed of the car =16√t inches per second

Ans B