1.

A body starts moving from rest and travels with uniform acceleration for 4 seconds and gains velocity 30 m/s. Then it continues to move with uniform velocity for 4 seconds. Then it starts retarding uniformly and comes to rest in further 2 seconds. The total covered distance by the body within the interval 4 s to 10 s is​

Answer»

\Large\mathtt\green{ }\huge\underline\mathtt\red{Answer : }

From the QUESTIONGRAPH is DRAWN above,

AREA of v−t graph⟹ DISTANCE travelled

vavg=t1+t2+t38s

21vm×t1=s

t1=vm2s

t2×vm=2s

t2=vm2s

21×t3×vm=5s

t3=vm10s

vavg=vm2s+vm2s+vm10s8s

vmvavg=74

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