Question

An object is starting from rest and moving with an acceleration of 3m/s². What will be its velocity after 15 seconds?​​

Answer 1

☯ Given :

• Initial velocity (u) = 0 m/s (∵ object is starting from rest)

• Acceleration (a) = 3 m/s²

• Time (t) = 15 s

☯ To Find :

• The final velocity of an object.

☯ Solution :

Applying 1st equation of motion,

v = u + at

[ Put the values ]

⇒ v = 0 + 3 × 15

⇒ v = 45 m/s

Hence, the final velocity of an object is 45 m/s.

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☯ For infomation :

2nd eqn. of motion, ie,. s = ut + ¹/2 × at²

3rd eqn. of motion, ie,. v² = u² + 2as

Work formula, ie,. w = F × s

Mirror formula, ie,. 1/v - 1/u = 1/f