Question

A racecar driver on a flat racetrack steps on the gas, changing her velocity from 10 m/sec to 30 m/sec in 5 seconds. What is the acceleration of the racecar during that time frame?

Answer 1

Answer:

4m/s2

Explanation:

The following data were obtained from the question:

U (initial velocity) = 10m/s

V (final velocity) = 30m/s

t (time) = 5secs

a (acceleration) =?

Acceleration is the rate of change of velocity with time. It is represented mathematically as:

a = (V - U)/t

Now, with this equation i.e

a = (V - U)/t, we can calculate the acceleration of the race car as follow:

a = (V - U)/t

a = (30 - 10)/5

a = 20/5

a = 4m/s2

Therefore, the acceleration of the race car is 4m/s2

Answer 2

Answer:

$a = 4\,\frac{m}{s^{2}}$

Explanation:

The acceleration of the racecar is:

$a = \frac{v-v_{o}}{\Delta t}$

$a = \frac{30\,\frac{m}{s} - 10\,\frac{m}{s} }{5\,s}$

$a = 4\,\frac{m}{s^{2}}$