Question

body starting from rest and moving with an uniform acceleration of 3 m/s²..What is its velocity after 15s?​

Answer 1

Answer :

□ The Final velocity of body = 45 m/s$\sf{ }$

Given :

Initial velocity of body = 0 m/s

Acceleration of body = 3 m/s²

Time taken by body = 15 sec

To Calculate :

Final velocity of body = ?

How To Calculate ?

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Here in this question we are provided that a body is in rest so it's initial velocity will be 0 m/s (because from rest), Acceleration of body is 3 m/s², and Time taken is also given which is 15 sec.

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 To calculate the Final velocity of body we'll use the first equation of motion which says v = u + at

Where,

• v is the Final velocity in m/s.

• u is the Initial velocity in m/s.

• a is the Acceleration in m/s².

• t is the Time taken in second.

Calculation :

From first equation of motion

• ⇒ v = u + at

• ⇒ v = 0 + 3 × 15

• ⇒ v = 0 + 45

• ⇒ v = 45

Hence, the Final velocity of body is 45 m/s.