Question

A car acquires a velocity of 72 km//h in 10 seconds starting from rest. Find (a) the acceleration (b) the average speed ( c ) the distance travelled in this time.

Answer 1

Answer:

a. 10 m/s²

b. 20 m/s

c. 200 m

Answer 2

Answer

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Explanation:

Here , initial velocity , u=0 , time taken , t=10s

final velocity , v=72 km/h=72×1000m60×60s=20m/s

(a) acceleration , a=v−ut=20−010=2m/s2

average velocity , vav=u+v2=0+202=10m/s

( c ) distance travelled , s=?

From v2−u2=2 as, s=v2−u22a=(20)2−02×2=100m