Define average speed. How is it different from average velocity? 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. Please answer fast i have exam day after tommorow...
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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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