Question

A car moving south speeds up from 10 m/s to 40 m/s in 15 seconds. What is the car’s acceleration? A. 2 m/s2 B.15 m/s2 C.30 m/s2 D.50 m/s2

Answer 1

A. 2 m/s^2

40-10=30
30÷15 =2

Answer 2

Answer:

Acceleration, $a=2\ m/s^2$

Explanation:

It is given that,

A car moving south speeds up from 10 m/s to 40 m/s in 15 seconds.

It means,

Initial velocity of the car, u = 10 m/s

Final velocity of the car, v = 40 m/s

Time taken, t = 15 seconds

We have to find the acceleration of the car. Mathematically, acceleration of the car is given by taking difference in velocities divided by time taken i.e.

$a=\dfrac{v-u}{t}$

$a=\dfrac{40\ m/s-10\ m/s}{15\ s}$

$a=2\ m/s^2$

Hence, this is the required solution.