ericn9683
Answered

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a car traveling at a speed of 30.0 m/s encounters an emergancy and comes to a complete stop. How much time will it tale for the car to stop if it decelerates at -4.0 m/s?

Sagot :

Answer:

the answer is 250kg but i am not sure

Explanation:

give me brainlest

StudiousStud3nt

Answer:

7.5 seconds

Explanation:

We can use the second equation of accelerated motion

vf = vi + a Δt

We know that the intial velocity (vi) is 30m/s, and the final velocity is 0 since it comes to a stop. We also know that the acceleration is -4m/s.

We can rearrange the equation for Δt (time)

vf = vi + a Δt

vf - vi = a Δt

(vf - vi)/a = Δt

and we can substitute the values into the equation for Δt now

Δt = (vf - vi)/a

Δt = (0 - 30)/-4

Δt = -30/-4

Δt = 7.5

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