Question

A new driver is speeding at 30m/s and sees the blue light of law enforcement in the distance and decides to slow down so he will not get a ticket. He taps the brakes and is soon going 25 m/s. If it took him 3s to do this what was his acceleration?

Answer 1

His acceleration was 5.468 ft/s3 .

Step-by-step explanation:

Here is how I got the answer

1. a = (v_f - v_i) / Δt,

2. a = 2 * (Δd - v_i * Δt) / Δt²,

3. a = F / m,

Answer 2

-1.6667 m/s2

Here is the Formula:

a = (v_f - v_i) / Δt,