Question

In a 100 m race Revanth and Rohan ran at an average speed of 8.4 m s-1 and 12.2
ms1
respectively. If 12 seconds is the time taken in school records for 100 metre race,
then which of the following can be true?
(a) Revanth broke the record.
(b) Rohan broke the record.
(c) Both Revanth and Rohan broke the record.
(d) Neither Revanth nor Rohan broke the record

Answer 1

option (d)

thank you

your answer is correct

Answer 2

Answer:

C. Both Revanth and Rohan broke the record.

Explanation:

given that,

                distance covered = 100m

  average speed of Revanth = 8.4ms⁻¹

     average speed of Rohan = 12.2ms⁻¹

the time taken to cover a distance is given by,

        time = distance / average speed

• Time taken by Revanth

               t₁ =  100m / 8.4ms⁻¹ = 11.9s

• Time taken by Rohan

              t₂ = 100m / 12.2ms⁻¹ = 8.2s

that means Revanth took 11.9s to complete 100m race and Rohan took 8.9s to complete the race. Since the school record is 12s, both of them broke the record.

Hence, option C is the correct answer.