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A physics teacher’s car is accelerating from a stop to 122 km/h. If the acceleration is measured at 3.2 m/s², what is the time it takes for the car to reach this speed?

A. 32.5 s
B. 38.1 s
C. 38.0 s
D. 36.9 s

Answer :

Final answer:

The time it takes for the car to reach a speed of 122 km/h is approximately 10.75 seconds.

Explanation:

To find the time it takes for the car to reach a speed of 122 km/h, we can use the equation:

v = u + at

Where:

  • v is the final velocity (122 km/h = 34.4 m/s)
  • u is the initial velocity (0 m/s)
  • a is the acceleration (3.2 m/s²)
  • t is the time taken

Rearranging the equation to solve for t:

t = (v - u) / a

Substituting the given values:

t = (34.4 m/s - 0 m/s) / 3.2 m/s²

t = 10.75 s

So, the time it takes for the car to reach a speed of 122 km/h is approximately 10.75 seconds.

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