Question

10. On a day when there is no wind, an athlete runs
a 100 m race in 14.2 s. A sketch graph showing
her speed during the race is given in figure,
(i) Calculate
(a) the acceleration of the athlete during
the first 3.0 s of the race,
(b) the speed with which she crosses the
finishing line
(ii) Suggest two differences that might be seen
in the graph if there had been a strong wind
opposing the runners in the race.​

Answer 1

Answer:

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Answer 2

Answer:

i)a) 2.6 m/s²

b)7.02 m/s

ii) The distance covered in the given interval of time would be much less on a day with more wind and acceleration would be much slower.

*Explanation:*

i) a)

a= v - u / t

a= 8 - 0/3

therefore, a= 2.6m/s

b) WKT, v = s/t

v = 100/14.2

v= 7.02 m/s

ii) answer is the explanation