Question

A car starting from rest with acceleration 2m/s². If its final velocity is 20m/s², find its displacement
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Answer 1

Answer:

u = 0

v = 20m/s

a = 2m/s²

v = u + at

20 = 0+ 20 × t

t = 1s

Displacement = v × t = 20 × 1 = 20m

Answer 2

Answer:

Explanation:

Correct Question,

A car starting from rest with acceleration 2 m/s².If its final velocity is 20 m/s, find its displacement .

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Solution,

Here, we have

Initial velocity of car, u = 0 m/s (As car starts from rest)

Final velocity of car, v = 20 m/s

Acceleration by car, a = 2 m/s²

To Calculate,

Displacement by car = ??

At, we will find time taken, t

According to 1st law of motion,

we know that,

v = u + at

So, putting the values, we get

⇒ v = u + at

⇒ 20 = 0 + 2 × t

⇒ 20 = 2t

⇒ 20/2 = t

⇒ t = 10

Now, displacement,

We know that,

Displacement = velocity × time

⇒ Displacement = 20 × 10

⇒ Displacement = 200 m.

Hence, the displacement by car is 200 m.