Question

A body starting from rest attains a velocity of 15m/s in 5seconds. Find its acceleration?​

Answer 1

Given:

• The body is starting from rest
• Attained velocity = 15 m/s
• Time taken = 5s

To find:

• Acceleration = ??

Solution:

Using the first equation of motion

v = u + at

• v → final velocity = 15m/s
• u → initial velocity = 0 m/s
• a → acceleration = ?
• t → time taken = 5s

Note : - Here, the initial velocity of the body will be zero because the body is starting from rest

Substituting the known values we have

→ 15 = 0 + a(5)

→ 15 = 5a

→ a = 15/5

→ Acceleration = 3 m/s²

Hence, acceleration of the body = 3 m/s²

Answer 2

Answer:

GIVEN = V=15m/s T=5s

initial velocity = u = 0 because body starts from rest

according to Newton's 1st equation of motion

v=u+at

15=0+a×5

15=5a

15/5=a

3=a

acceleration = 3m/s²