Question

A car is moving northeast at a velocity of 10 meters per second. Four

Answer 1

The average acceleration of car during this time is 5 $m/s^2$ Northeast.

Answer: Option C

Explanation:

The acceleration exerted by an object is the rate of change in velocity the object undergoes with respect to time. Average acceleration is the measure of variation in acceleration in a given interval of time.

$\text {Average acceleration}=\frac{\text {Final velocity - Initial velocity}}{\text {Time Period}}$

Here, final velocity is 30 m/s and initial velocity is 10 m/s. The final velocity is attained by the car after 4 s. Thus, the average acceleration will be

$\text {Average acceleration}=\frac{30-10}{4}=\frac{20}{4}=5 \frac{\mathrm{m}}{\mathrm{s}^{2}}$

So, the average acceleration is 5 $m/s^2$ and as the car was moving in the northeast direction, the average acceleration will also be exerting in the northeast direction only.