Young athlete has a mass of 42 kg one day there is no wind shear and hundred metre race in 14.2 second a sketch graph not in sketch showing her speed during the race is

icalculate the acceleration of the athlete during the first 3 seconds of the race
ii the escalating for of the athlete during the first 3 seconds of the race
iii the with whicj she crosses the finish line.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.