Question

an athlete runs on a circular track whose radius is 50 m with a constant speed. it takes 50 seconds to reach point b from the starting point a by completing half of the circular track. Find
a. Distance covered
b. Displacement
c.speed

Answer 1

Answer:

Answer :

Part A :

distance = πr = 50π = 157.14 m

Part B  

Displacement =  2r = 2 x 50 = 100 m  

Part C  

distance / time = speed = 157.14/50 = 3.14 m/s or π m/s

Explanation:

Answer 2

Answer:

Distance covered = 314m

Displacement = 0

Speed = 3.14 m/s

Explanation:

Circumference of circle =2πr

=2 × 3.14 × 50

= 314m

Therefore, Distance covered = 314m

Here, 50sec for half-round, Therefore, 100 sec is equal to a full round.

a) Distance = 2πr

= 314m

b) Displacement = 0

because he came to start point again therefore displacement = 0

c) speed = distance/time

s = 314/100

s = 3.14 m/s or π m/s

Therefore, speed = 3.14 m/s or π m/s.

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