7. At a different point on the hill, the skateboarder above has 900 J of potential energy. According to the law of conservation of energy, how much kinetic energy will the
skateboarder have at this point?
A. 600 )
B. 900 J
C. 1500 J
D. 2400 J

Wish i knew this to !

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.