Question

A jet accelerates from rest along a runway to reach a velocity of 100m/s in 20s. Use the formula a =( v - u) /t where a = acceleration, u = initial velocity and v = final velocity.

Answer 1

V = 100 , U = 0 , t= 20

a= v-u/t

a= 100-0/20

a= 100/20

a = 5

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Answer 2

Given:-

• Initial velocity ,u = 0m/s

• Final velocity ,v = 100m/s

• Time taken ,t = 20s

To Find:-

• Acceleration,a

Solution:-

As we know that the acceleration is defined as the rate of change of velocity at per unit time.

• a = v-u/t

Substitute the value we get

→ a = 100-0/20

→ a = 100/20

→ a = 5m/s²

Therefore, the acceleration of the jet is 5m/s².

Additional Information!!

• The rate of change of velocity at per unit time is called acceleration .

• SI unit of acceleration is m/s²

• It is vector Quantity ( both magnitude and direction).