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**Mechanics ;;; please need Urgent help!!!!**

hi everyone, i'm seeking help from anyone from this forum about my mechanics problem.

it's under WORK, ENERGY AND POWER section.

A resistive force acts on a cyclist, as she free-wheels down a straight hill at constant speed. The cyclists and her machine are modelled as a particle of mass 70kg , and the resistive force as a constant force. This constant force has a magnitude 48N and asts upwards in a direction parallel to the hill. Calculate the angle of inclination of the hill to the horizontal.

The cyclist reaches the foot of the hilla t a speed of 6ms^-1 and starts to padal, travelling along a horizontal straight road. The cyclist works at a constant rate of 624 W. by modelling the resistive fprce as a constant horizontal force of magnitude 48N, calculate the acceleration of the cyclist immediately after she starts pedalling. Show that her subsequent speed on the horizontal road connot exceed 13 ms^-1.

I have the answer from the book but it doesn't explain how to get these answer. i got the first part, i just type it to get the whole question. the answers are

4.01* for first part

0.8 ms^-2 for second part

Thanks so much to everyone.