Physics, asked by abinreji, 1 year ago

a car travels a distance of 20km at a speed of 80km/h and a distance of 30km with a speed of 90km/h calculate the average speed of the car plzzzz answer this question

abinreji: plzzzz

abinreji: answer this question

abinreji: plzzz explain it

ruchi2719: m=20km. n =30km p =80km/h. q = 90km/h

ruchi2719: put this in the formula (m+n) pq ÷ mq +np

Answers

Answered by Akankshaacharya

Here S1=20 km

V1=80km/h

so time(T1)=S1/V1

=(20/80) h

=1/4 h

S2=30km

V2=90 km/h

time(T2) = S2/V2=(30/90)h=1/3 h

so average speed=S1+S2÷T1+T2

= 20+30/1/3+1/2=50*6/5 =60km/h

abinreji: the answer is wrong

Akankshaacharya: what is the answer then ??

abinreji: 85.71

Akankshaacharya: This answer may be wrong

Akankshaacharya: according to me 10 is the right answer

abinreji: i don't know

kmitanshi27: Ans.85.7

Strangercitizen1525: is it the t.b and?

Strangercitizen1525: ans?

ruchi2719: 2pq÷(p+q) do it with this Formula... where p and q are the 2 relative speeds

Answered by Strangercitizen1525

case 1
d = 20km
v = 80km/h
t 1 = d / v
= 20 / 80
= 1/4 hrs
case 2
d = 30 km
v= 90km/ h
t = d / v
t 2 = 1/ 3 hrs
total time = t1 + t2
= 5 /6 hrs
total distance = 50km
average speed
= total distance / total time taken
= 50 / (5/6)
= 60km/ h (ans)

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