Question

A car moving on a straight road at 5 m/s. It is accelerated at 3 m/s$^{2}$ . What will be its velocity after 4 seconds ?​

Answer 1

Answer:

Its velocity after 4 seconds will be 7 m/s.

Explanation:

Given:

• Initial velocity of the car (u) = 5 m/s

• Acceleration of the car (a) = 3 m/s$^{2}$

• Time (t) = 4 seconds

To find:

Velocity after 4 seconds.

Solution:

We will find the velocity using the first equation of motion.

• v = u + at

where v is final velocity

u is initial velocity

a is acceleration

and t is time.

Now substitute the known values.

v = u + at

=> v = 5 + 3 × 4

=> v = 5 + 12

=> v = 17 m/s.

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More formulas:

First equation of motion:

• v = u + at

Second equation of motion:

• S = ut + 1/2 at$^{2}$

Third equation of motion:

• 2 as = v$^{2}$ – u$^{2}$

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