Question

A 89.1-kN car is traveling at 73.1 mph when the driver decides to exit the freeway by going up a ramp. After coasting 411 m along the exit ramp, the car's speed is 28.5 mph, and it is:

a) Moving with constant acceleration up the ramp.
b) Experiencing negative acceleration due to friction.
c) Moving with constant velocity up the ramp.
d) Accelerating due to gravitational forces.

Answer 1

To determine the car's acceleration up the ramp, we can use the formula (vf - vi) / t. However, since the acceleration is not given in the problem, we cannot determine the exact answer. Therefore, the correct choice is uncertain.

Step-by-step explanation:

To determine the car's acceleration up the ramp, we need to compare its initial and final velocities.

Given:

• Initial velocity (vi) = 73.1 mph
• Final velocity (vf) = 28.5 mph

To find the acceleration, we can use the formula:

Acceleration (a) = (vf - vi) / t

Where t represents the time taken to travel along the ramp. Since no time is given, we will assume it to be the same as the initial time it took to travel at 73.1 mph.

Now we convert the velocities from mph to m/s:

• Initial velocity (vi) = 32.6 m/s
• Final velocity (vf) = 12.8 m/s

Since the car's acceleration is not given, we can't determine whether it's constant, accelerating due to gravitational forces or experiencing negative acceleration due to friction. Therefore, the correct answer is:

d) Uncertain