Question

A sprint runner completes 1 round of a circular track of radius 3m in 30 sec.
What will be the displacement at the end of 2 min 15 sec? Statement 1: The displacement of a body may be zero, though its distance
can be finite.
Statement 2: If a body moves such that finally t arrives at initial point, then
displacement is zero while distance is finite.
a) Both Statement 1 and 2 are true and Statement 2 is the correct explanation of
Statement 1.
b) Both Statement 1 and 2 are true but Statement 2 is NOT the correct explanation
of Statement 1.
c) Statement 1 is True while Statement 2 is False
d) Statement 1 is False while Statement 2 is True

Answer 1

Answer:

H

6.7.20

identify the tense of

the underlined verb

in each sentence. Both Statement 1 and 2 are true but Statement 2 is NOT the correct explanation

of Statement 1.

c) Statement 1 is True while Statement 2 is False

d) Statement 1 is False while Statement 2 is True

Answer 2

The displacement at the end of 2 min 15 sec is 6 m

The correct option is (a) Both Statement 1 and 2 are true and Statement 2 is the correct explanation of Statement 1.

Given: A sprint runner completes 1 round of a circular track of radius 3m in 30 sec.

Statement 1: The displacement of a body may be zero, though its distance can be finite.

Statement 2: If a body moves such that finally t arrives at the initial point, then the displacement is zero while distance is finite.

To Find: The displacement at the end of 2 min 15 sec. And the correct option.

Solution:

• We know that if a body moves such that finally arrives at the initial point, then, displacement is zero while distance is finite.

We are given that the sprinter covers 1 round in 30 sec.

So, in 2 min 15 sec, he will cover = 135 / 30

                                                       = 4.5 rounds

Hence, the displacement in the last half round will be the diameter of the circular track.

The displacement is = 2 × radius  

                                  = 2 × 3 m

                                  = 6 m

Hence, the displacement at the end of 2 min 15 sec is 6 m.

Statement 1 is true and statement 2 is the correct explanation of statement 1.

So the correct option is (a) Both Statement 1 and 2 are true and Statement 2 is the correct explanation of Statement 1.

Hence, the displacement at the end of 2 min 15 sec is 6 m

The correct option is (a) Both Statement 1 and 2 are true and Statement 2 is the correct explanation of Statement 1.

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