Question

f a car has covered a distance of 300m in 20s , then the speed of car will be
(1 Point)
10m/s
15m/s
20m/s
25m/s

Answer 1

Answer:

Time average of velocity=(V1t1+V2t2)/(t1+t2)

=(V1(S1/V1)+ V2(S2/V2))/(S1/V1)+(S2/V2)

=(S1+S2)/(S1/V1+S2/V2)

=2S/S(1/V1+1/V2)

=2V1V2/(V1+V2)

=2×20×30/(20+30)

=24m/s