An athlete covers one round of a circular track of diameter 200m in 40

1.	An athlete covers one round of a circular track of diameter 200m in 40 sec. What will be the distance covered and displacement at the end of 2 min 20 sec?
Answer» Answer: At the end of 2 min 20 sec., • Distance covered is 2200m • Displacement is 200m. Explanation: Given: Diameter of circular track = 200m Time taken for 1 ROUND = 40 sec. To find : The distance covered and displacement Solution : Diameter = 200m Radius = 200 / 2 100m Therefore, Radius = 100m Time taken for 1 round = 40 sec. First convert minute into seconds So, 2min. 20 sec. = 140 seconds Number of round = 140 / 40 3.5 means 3 and half round Therefore, Number of round = 3.5 Circumference of circle = 2 π r Distance covered = 3.5 × Circumference of circular track ➙ 3.5 × 2 π r ➙ 3.5 × 2 × 22 / 7 × 100 ➙ 2200m Therefore, At the end of 2 min 20 sec., Distance covered is 2200m Displacement is 200m.

An athlete covers one round of a circular track of diameter 200m in 40 sec. What will be the distance covered and displacement at the end of 2 min 20 sec?

Answer»

Answer:

At the end of 2 min 20 sec.,

• Distance covered is 2200m

• Displacement is 200m.

Explanation:

Given:

Diameter of circular track = 200m

Time taken for 1 ROUND = 40 sec.

To find :

The distance covered and displacement

Solution :

Diameter = 200m

Radius =

200 / 2

100m

Therefore,

Radius = 100m

Time taken for 1 round = 40 sec.

First convert minute into seconds

So,

2min. 20 sec. = 140 seconds

Number of round = 140 / 40

3.5 means 3 and half round

Therefore,

Number of round = 3.5

Circumference of circle = 2 π r

Distance covered = 3.5 × Circumference of circular track

➙ 3.5 × 2 π r

➙ 3.5 × 2 × 22 / 7 × 100

➙ 2200m

Therefore,

At the end of 2 min 20 sec.,

Distance covered is 2200m

Displacement is 200m.

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