Question

The driver of a 2.0 × 103 kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 103 N acts on the car. Ignore air resistance.(b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur?

Answer 1

Answer:

7500d=0.5(2000)(45)

2

d=270 m