n Problems 1- A car is travelling at an unknown speed when the driver applies th

Question

n Problems 1- A car is travelling at an unknown speed when the driver applies the brakes and comes to a stop in 5 seconds. Calculate it's travelling velocity and the distance travelled after the brakes were applied. The car decelerates at -7 m/s2 brakes. Assuming the car can decelerate at 30 m/s2, calculate the car's travelling distance after the brakes are applied as well as the time it takes for the car to stop. 2-A car is travelling at 10 m/s accelerates at 25 m/s? for 5 s until the driver notices an obstacle and applies the

Explanation / Answer

Solution)

We know, v²=u²+2aS

Here, final velocity v=0

Initial velocity, u= ?

Retartdation, a=-7m/s^2

Time,t=5secs

Substituting values, we get

V=u+a*t

O=u-7*5

U=35m/sec (Ans)

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Now, calculating distance travelled

0²=35²+2*(-7)*S
0=1225-14*S
S= 87.5m ( Ans)

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According to Chegg Guidelines, I can answer only one at a time. Good luck!:)

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