Calculate the velocity for any three times of intervals.
Answers
Questions:
1. John travels 102 km in 5 hours to get to a place directly East of him. What is his speed? What is his velocity?
2. Mr. Q is traveling West at a velocity of -100 mph. What is Mr. Q's speed? How far and in what direction will Mr. Q have reached in 4 hours?
3. A car on a circular race track is going round and round in circles as part of a race. The car is traveling at a speed of 200 km per hour. What is the velocity of the car on the finish line and why?
Answers
1. John's speed is given by SPEED = DISTANCE/TIME or SPEED = 102/5 = 20.4 km per hour.
His speed is 20.4 km per hour while his velocity is 20.4 km per hour East.
2. Mr. Q's speed is 100 mph. However, since his velocity is negative 100 mph West, he is traveling East at 100 mph.
Hence he will have reached DISTANCE = SPEED x TIME = 100 x 4 = 400 miles in 4 hours in the East direction.
3. Even though the car's speed is 200 km per hour, the car always returns back to its starting point on account of the race track being circular.
Hence the velocity of the car is zero since the car does not change its position in time.