Question

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration in meters per second per second?

1) 40100.25
2) 4.02
3) 2.8

Answer 1

The acceleration of the car that starts from rest and reaches a velocity of 40 m/s in ten seconds is 4 m/s².

Therefore, option 2) is correct.

Step-by-step explanation:

When a car starts from rest and reaches a velocity of 40 m/s in ten seconds, its acceleration can be calculated using the formula a = (v - u) / t, where a is acceleration, v is the final velocity, u is the initial velocity, and t is the time.

Since the car starts from rest, u = 0 m/s, v = 40 m/s, and t = 10 s.

Substituting these values into the formula gives us a = (40 m/s - 0 m/s) / 10 s = 4 m/s².

Therefore, the correct acceleration of the car is 4 m/s², which corresponds to option 2) 4.02 (assuming 4.02 is a rounding of the exact 4 m/s²).