Question

Starting from rest, the Road Runner accelerates at 3 m/s for ten seconds. What is the final velocity of the Road Runner?

Answer 1

(3 m/s²) x (10 s) = 30 m/s

His speed at the end of 10 sec is 30 m/s.  We can't describe his velocity, because we have no information about the direction he's moving.

Answer 2

Answer

The answer to this question is $30 ms^{-1}$

Explanation

As we know that accelartion is the rate of change of velocity. So, it can be write as

$a = (V_f -V_i) /t$

where

$V_f$ is the final velocity

$V_i$ is the initial velocity

t is the time

a is the accelartion

as we konw

$a = 3 ms^{-2}$

t = 10 s

From rest So,

$V_i$ = 0

$V_f$ = ?

Putting values

$3 = (V_f - 0)/10$

$3 * 10 = V_f$

$30 = V_f$

$V_f = 30 ms^{-1}$

So, the right answe is $30 ms^{-1}$