An athlete completes 100 m race in 9.8 msecond. What is speed in km/ hr. Assume the athlete to be running with uniform speed.
Share
An athlete completes 100 m race in 9.8 msecond. What is speed in km/ hr. Assume the athlete to be running with uniform speed.
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Let us write the given data first
GIVEN:
Total distance of the race (S) = 100 m
Time taken to complete the race (T) = 9.8 sec
TO FIND:
Speed at which athlete completed the race = ?
HINT GIVEN:
Athlete ran with uniform constant speed { means his speed remains constant }
FORMULA:
Speed = Distance / time
= 100/9.8
= 10.2040 m/s
Given that we need to convert m/s into km/hr,
So,
Speed = 10.2040 × 5/18
= 51.02040/18
= 2.83446666 so on
Speed ≅ 2.84 km/hr
Hence uniform speed at with athlete run is 2.84 km/hr
❆ Use the newtons 3 laws of motion according to given quantities and find the answers . They are,
❆ v = u + at
❆ s = ut + 1/2 at²
❆ v² - u² = 2as
❆ Sn = u + (2n -1) used to find time in nth seconds
❆ In case when distance and time are given use
❆ Speed = Distance / Time ❆
❆ With these formulas you can apply the given quantities and find the answers
To learn about this answer detailly refer,
brainly.in/question/16808022
Thanks for asking
Hope it helps