Advertisements
Advertisements
Question
A car travels 30 km at a uniform speed of 60 km/h and the next 30 km at a uniform speed of 20 km/h. What is its average speed?
Advertisements
Solution
Car travls 30 km distance with speed 60 km/hr
Time taken by car to travel this distance = 30/60 = 0.5 hr.
Car travels another distance of 30 km with speed of 20 km/hr.
Time taken by car to travel this distance = 30/20 = 1.5 hr.
Total time taken = 1.5 + 0.5 = 2 hr.
Total distance = 30+ 30 = 60 km.
Average speed of car = 60/2 = 30 km/hr.
APPEARS IN
RELATED QUESTIONS
A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.
Define Speed.
A car travels from P to Q at a uniform speed of 20 ms-1 and immediately turns back and travels towards Q with a uniform speed of 30 ms-1. What is the average speed for the whole journey?
Complete the analogy.
Distance : metre :: Speed: ______?
Suppose a boy is enjoying a ride on a merry go round which is moving with a constant speed of 10 m/s. It implies that the boy is
A spaceship travels 36,000 km in one hour. Express its speed in km/s.
Why did the actual speed differ from the average, speed?
______ measures the instantaneous speed of the automobile.
Distinguish between speed and velocity.
