Question

A car slams on its brakes, coming to a complete stop in 4.0 s. The car was traveling north at 60.0 mph. Calculate the acceleration.

Answer 1

v=v0+at

Answer 2

v will be 0 as it end with a stop, v0=60 initial speed

Answer 3

so substitute and calculate the acceleration, it can be clearly seen that it is in negative direction

Answer 4

0=60+a4
64 a?

Answer 5

Here:\[\rm acceleration = \dfrac{initial ~velocity - final~velocity}{time~gap}\]

Answer 6

0-60.0/4

Answer 7

And how do you simplify that?

Answer 8

a=-15

Answer 9

you have just solved

Answer 10

thanks!