Answer to Question #91877 in Mechanics | Relativity for Rabi Nasr

Question

1. Ahmad is driving North on Highway 69 at 90 km/h and sees a large moose on the road. He quickly slams on his brakes, but his reaction time is 0.85 s (as he sees the moose, thinks about his response, and then presses the brake pedal). He presses the brake for 3.5 s and comes to a stop just in time.
a) Find the distance travelled after seeing the moose and before pressing the brake.

Answer 1

The distance travelled after seeing the moose and before pressing the brake

$$d=vt$$

$$=90\times(\rm{1000\:m/3600 \:s})\times{0.85\:\rm{s}}=21.25\:\rm{m}$$