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# A Car Acquire a Velocity of 72 Km per Hour in 10 Second Starting from Rest. Find (1) the Acceleration, (2) the Average Velocity, and (3) the Distance Travelled in this Time. - CBSE Class 9 - Science

ConceptRate of Change of Velocity

#### Question

A car acquire a velocity of 72 km per hour in 10 second starting from rest. Find

(1) the acceleration,
(2) the average velocity, and
(3) the distance travelled in this time.

#### Solution

We have the following information,
Initial velocity, (u) = 0 m/s
Final velocity
(v) = 72 km/hr
= "72(1000)"/3600 m/s
= 20 m/s
Time taken , (t) = (10) s
(i) So acceleration,
a = (v-u)/t
Put the values in the above equation to get the value of acceleration
a = (20-0)/10
= 2 "m/s"^2
(ii) we have to find the average velocity. we will use the following relation,
Average velocity = "Initial velocity + Final velocity"/2
So , Average velocity = (v+u)/2
Therefore putting the value in the above to get the avearge velocity ,
Average velocity = (20+0)/2  m/s
= 10 m/s
(iii) We have to calculate the distance travelled. We will use the relation,
Distance travelled = (Average velocity) (Time)
So distance travelled is,
= (10)(10) m
= 100 m

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Solution A Car Acquire a Velocity of 72 Km per Hour in 10 Second Starting from Rest. Find (1) the Acceleration, (2) the Average Velocity, and (3) the Distance Travelled in this Time. Concept: Rate of Change of Velocity.
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