Question

What is the deceleration of a vehicle moving in a straight line that changes its velocity from 100kmph to a dead stop in 10d

Answer 1

Correct Question

• What is the deceleration of a vehicle moving in a straight line that changes its velocity from 100 km/h to stop in 10s.

Given:-

• Initial velocity ,u = 100km/h

• Final velocity ,v = 0m/s

• Time taken ,t = 10s

To Find:-

• Deceleration of the vehicle , a

Solution:-

Conversion of Unit

100km/h = 100×5/18= 62.5 m/s

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

Negative acceleration is called deceleration.

• a = v-u/t

Substitute the value we get

→ a = 0-62.5/10

→ a = -62.5/10

→ a = -6.25 m/s²

∴ The deceleration of the vehicle is 6.25 m/s²