Question

1.A particle is moving up an inclined plane. Its velocity changes from 15m/s to 10m/s in two seconds. What is its acceleration? *

Answer 1

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Provided:-

• Initial velocity = 15 m/s
• Final velocity = 10 m/s
• Time taken = 2 s

To FinD:-

• Accleration of the particle....?

How to solve?

We will solve the above Question by using equations of motion that are:-

• v = u + at
• s = ut + 1/2 at²
• v² = u² + 2as

Here,

• v = Final velocity
• u = Initial velocity
• a = acceleration
• t = time taken
• s = distance travelled

Work out:

By using first equation of motion,

⇛ v = u + at

⇛ 10 = 15 + a(2)

⇛ -5 = 2a

Flipping it,

⇛ 2a = -5

⇛ a = -2.5 m/s² [ANSWER]

❍ Acclearation is negative because final velocity is less than Initial velocity.

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