Question

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.

Options

• 2.4 m/s

• 7.8 m/s

• 2.6 m/s

• 23.5 m/s

Answer 1

23.5 m/s

Explanation:

v = u + at

0 = u - 0.8 × 3 × 9.8

u = 23.5 m/s