Felipe drives his car at a velocity of 28 m/s. He applies the brake, which slows the vehicle down at a rate of 6.4 m/s2 and causes it to slow to a stop. How long does it take for the car to stop? Round your answer to the nearest tenth.

4.4 seconds

Explanation:

use the equation

v(final)=v(initial)+a(t)

what we know:

v(initial)=28mps

v(final)=0 because it comes to a stop

a= -6.4    it is negative because the 6.4 is resisting forward motion

using these you get

0= 28 + (-6.4)t

6.4(t)=28

t=4.375 sec

and with rounding

t=4.4 sec

4.4

Explanation:

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