Question

A car is moving at 45mph. Once the care starts to break, its speed(s) is related to the number of seconds(t) it spends breaking according to the formula below.

S = -10t +45

Determine how many second it takes for the car to stop.

Answer 1

35=-10t +45, i think sorry if im wrong

Explanation:

Answer 2

Explanation:

When the car stops, the speed is zero.

When S = 0, -10t + 45 = 0, t = 4.5.

Hence it will take 4.5 seconds for the car to stop.