Acyclist is coasting at 12 m/s when she starts down a 450-m-long slope that is 30 m high. the cyclist and her bicycle have a combined mass of 70 kg. a steady 12 n drag force due to air resistance acts on her as she coasts all the way to the bottom. what is her speed at the bottom of the slope?

The speed of her at the bottom is 24.035 m/s.

Explanation:

Given that,

Speed of cyclist = 12 m/s

Height = 30 m

Distance d = 450 m

Mass of cyclist and bicycle =70 kg

Drag force = 12 N

We need to calculate the speed at the bottom

Using conservation of energy

K.E+P.E=drag force+K.E+P.E

Potential energy is zero at the bottom.

K.E+P.E=drag force+K.E

Hence, The speed of her at the bottom is 24.035 m/s.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.