<h2>Answer :</h2>
□ The Final velocity of body = 45 m/s
Initial velocity of body = 0 m/s
Acceleration of body = 3 m/s²
Time taken by body = 15 sec
<h2>To Calculate :</h2>Final velocity of body = ?
<h2>How To Calculate ?</h2><h3>❒ </h3>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.
<h3>❒</h3>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.
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.