Explanation:

HLW MATE HERE IS YOUR CORRECT....

DEFINE AVERAGE SPEED.

ANS:

The total distance travelled by a body in a definite interval of time is known as average speed.

FORMULA :

S = d/t

s = speed

s = speedd = distance traveled

s = speedd = distance traveledt = time elapsed

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HOW IS IT DIFFERENT FROM AVERAGE VELOCITY ?

ANS:

Average speed takes distance, that is total length travelled while being measured, while average velocity takes displacement, that is the straight distance from the original position to the final position.

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PROBLEMS:

A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns back with a uniform speed of 20 km/h. Find his AVERAGE SPEED.

ANS:

Let distance between A and B is D

Then, time taken by motorcyclist with uniform speed 30 km/h ,T₁ = distance/speed = D/30 hrs

Again, they return with uniform speed 20 km , so time taken by motorcyclist , T₂ = D/20 hrs

Now, average speed of motorcyclist = total distance/total time taken

= (D + D )/(D/30 + D/20) km/h

= 2 × 30 × 20/(30 + 20) km/h

= 24 km/h

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