Question

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

Answer 1

Answer:

45 m/s . I think this will help you

Answer 2

Answer :

›»› The Final velocity of body = 45 m/s

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 ?

❒ 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.

❒ 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.║

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Additional Information :

★ First equation of motion :

⪼ 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.

★ Second equation of motion :

⪼ s = ut + ½ at²

Where,

• s is the Distance travelled in m.
• u is the Initial velocity in m/s.
• t is the Time taken in second.
• a is the Acceleration in m/s².

★ Third equation of motion :

⪼ v² = u² + 2as

Where,

• v is the Final velocity in m/s.
• u is the Initial velocity in m/s.
• a is the Acceleration in m/s².
• s is the Distance travelled in m.