Question
Question: The coefficient of static friction between a car’s tires and a level road is 0.80. If the car is to ...
The coefficient of static friction between a car’s tires and a level road is 0.80. If the car is to be stopped in a maximum time of 3.0 s, its speed cannot exceed
A
2.4 m/s
B
7.8 m/s
C
2.6 m/s
D
23.5 m/s
Answer
23.5 m/s
Explanation
Solution
v = u + at
0 = u – 0.8 × 3 × 9.8
u = 23.5 m/s