Question

the velocity of a motorcycle increases by an acceleration of 2 metre per second and become 20 metre per second in 5 second find the initial velocity of a car ​

Answer 1

Given :

Acceleration = 2m/s²

Final velocity = 20m/s²

Time interval = 5s

To Find :

Initial velocity of motorcycle.

Solution :

⧪ Acceleration is defined as the rate of change of velocity$.$

• It is a vector quantity having both magnitude as well as direction.
• It can be positive, negative or zero.
• SI unit : m/s²
• CGS unit : cm/s²

Motorcycle has constant acceleration throughout the motion, so we can apply equation of kinematics in order to find initial velocity of bike.

Let's apply first equation of kinematics;

➠ v = u + at

• v denotes final velocity
• u denotes initial velocity
• a denotes acceleration
• t denotes time

By substituting the values;

➠ 20 = u + (2)(5)

➠ 20 = u + 10

➠ u = 20 - 10

➠ u = 10 m/s