Question

A car attains a velocity of 54 kilometre per hour ( 15 metre per second) within 5 seconds from an initial velocity of 18 kilometre per hour ( 5 metre per second). Calculate its acceleration?

Answer 1

Given:-

• Initial Velocity = 18km/h → 5m/s

• Final Velocity = 54km/h → 15m/s

• Time Taken = 5s.

To Find:-

• The Acceleration of car.

Formulae used:-

• v = u + at

where,

• v = Final Velocity
• u = Initial Velocity
• a = Acceleration
• t = Time.

Now,

→ v = u + at

→ 15 = 5 + a × 5

→ 15 = 5 + 5a

→ 15 - 5 = 5a

→ 10 = 5a

→ a = 10/5

→ a = 2m/s²

Hence, The Acceleration of car is 2m/s².

Answer 2

Answer:

acceleration = change is V / change on time

= (V-U )/t

= (15-5)/5

= 2 m per sec^2