Question

The velocity of a particle at an instant is 10 m/s and
after 5s the velocity of the particle is 20 m/s. The
velocity 3s before in m/s is:​

Answer 1

Explanation:

acceleration will constant

answer will be 4m/s

Answer 2

Answer:

Velocity of the particle is 10 m/s

After 5s the velocity = 20 m/s

Velocity of the particle in 3 Seconds = ??

★ Acceleration = (v - u)/t

• v = 20
• u = 10
• t = 5

⇒ (20 - 10) / 5

⇒ 2 m/s²

Acceleration of body is 2 m/s²

★ v = u + at

• v = 10
• u = ??
• a = 2
• t = 3

⇒ 10 = u + (2 × 3)

⇒ u = 10 - 6

⇒ u = 4 m/s

Velocity before 3 seconds was 4 m/s