Question

A car is traveling at 15 m/s on a horizontal road. The brakes are applied and the car skids to a stop in 4.0 s. The coefficient of kinetic friction between the tires and road is:

Select one:

a. 0.38

b. 0.69

A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to return to its starting point?

Select one:

a. 7.20 s

b. 10.2 s

c. 14.7 s

d. 11.0 s

e. 3.67 s

A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration. The acceleration of the car is:

Select one:

a. 4.9 m/s²

b. 0.4 m/s²

c. 2.5 m/s²

d. 9.8 m/s²

e. 1.3 m/s²

c. 0.92

d. 0.76

e. 1.11

The result of adding 1 mm to 1 cm in SI units is

Select one:

a. 1.1×10^-3 m

b. 1.1×10^-4 m

c. 2.0×10^-2 m

d. 1.1×10^-2 m

e. 2.1×10^-2 m

Answer 1