Question

a body moving along a straight line at 20 m/s undergone an acceleration of kilometre per second square. what will be it's speed after 2 seconds

Answer 1

Answer:

The question is incomplete. The correct question is:

A body moving along a straight line at 20 m per second undergoes an acceleration of 4 m per second square after 2 seconds what will be its speed.

Given that Speed is 20 m/s, Acceleration is 4 m/s²

Also it is given that time taken for calculating final speed is 2 seconds.

Using the First Equation of Motion we get,

⇒ v = u + at

According to the question,

• u = 20 m/s
• a = 4 m/s²
• t = 2 sec

⇒ v = 20 + 4 ( 2 )

⇒ v = 20 + 8

⇒ v = 28 m/s

Therefore Velocity of the body after 2 seconds is 28 m/s.

Hope it helped !!