1.Marc runs from one end to the other end of a semicircular track whose radius is 140m. What is the distance covered by the marc and what is his displacement?
2.A jogger moves 500m in 2 minutes and next 1000m in 30s on the same straight path. What is his average speed and average velocity?
2.A jogger moves 500m in 2 minutes and next 1000m in 30s on the same straight path. What is his average speed and average velocity?
Answers & Comments
Answer:
1) Distance =440mtr.
Displacement= 280mtr
Explanation:
As we know that Circumference of a circle is 2πr
Given;
Radius of the circle = 140mtr
He moves on a semicircular path .
Circumference of a semicircular path would be;
2πr/2 i.e (πr)
So;
Distance would be = πr = 22/7×140 = 440 and;
Displacement would be = 2r = 280