Question

A longboarder with a mass of 60 kg starts from rest and begins going downhill. She increases her speed to 10 m/s in 5 seconds. What force did it require for her to speed up?

A. 60 N
B. 120 N
C. 300 N
D. 600 N

Answer 1

The force required for the longboarder to speed up is 120 N.

Step-by-step explanation:

To calculate the force required for the longboarder to speed up, we can use Newton's second law of motion which states that force is equal to mass times acceleration. In this case, the mass of the longboarder is 60 kg and the time taken to increase the speed is 5 seconds. We can calculate the acceleration using the equation acceleration = change in velocity / time. Therefore, acceleration = (final velocity - initial velocity) / time = (10 m/s - 0 m/s) / 5 s = 2 m/s².

Using Newton's second law, force = mass x acceleration, we can plug in the values to find the force required. Force = 60 kg x 2 m/s² = 120 N.

Therefore, the force required for the longboarder to speed up is 120 N which is option B.