The US athlete Florence Griffith-Joyner won the 100 m sprint gold medal at Seol Olympic 1968 setting a new Olympic record of 10.54s.Assume that she achieved her maximum speed in a very short-time and then ran the race with that speed till she crossed the line.Take her mass to be 50 kg.Calculate the kinetic energy of Griffith-Joyber at her full speed.Assuming that the track,the wind,etc.offered an average resistance of the tenth of her weight,calculate the workdone by the resistance during the run.What power Griffith-Joyner had to exert to maintain uniform speed?

Open in App

Solution

Suggest Corrections

Similar questions

The US athlete Florence Griffith - Joyner won the 100 m sprint gold medal at SeoulOlympic 1988 setting a new Olympic record of 10.54 s. Assume that she achieved her maximum speed in a very short-time and then ran the race with that speed till she crossed the line. Take her mass to be 50 kg. Assuming that the track, the wind etc. offered an average resistance of one tenth of her weight, calculate the work done by the resistance during the run.

Q. The

200 m

free style women's swimming gold medal at Seol Olympic

1988

went to Heike Friendrich of Each Germany when she set a new Olympic record of

1

minute and

57.56

seconds. Assume that she covered most of the distance with a uniform speed and had to exert

460 W

to maintain her speed. Calculate the average force of resistance offered by the water during the swim.

The 200 m free style women's swimming gold medal at Seol Olympic 1988 went to Heike Friendrich of East Germany when she set a new Olympic record of 1minute and 57.56 seconds. Assume that she covered most of the distance with a uniform speed. Calculate the average force of resistance offered by the water during the swim.

Q. This athlete has won a combined total of

19

Olympic and World Championship medals. With her win in Rio, she became the

6^{t h}

woman to have won an individual all-around title at both the World Championships and the Olympic Games. Can you identify her?

Q. Manisha cycles to her school at an average speed of 15 km/hr and takes 30 minutes to reach her school. If she wants to reach her school in 15 minutes, then what should be her average speed?

Join BYJU'S Learning Program