A man on a motorcycle starts from rest from a point A at the bottom of one hill and travels to a point B at the bottom of another hill. The total distance of the journey is 120 km. The resistance to motion is constant at 300 N throughout the journey. Point A is 1500m higher than point B.

The total mass of the man and his motorcycle is 240kg. When the motorcyclist reaches the point B, his speed is 90 km/h. Calculate the work done by the motorcycle during the journey.

OK basically my tutor has left me with this equation.

Total energy at (t=t) = Total energy at t=0

$\displaystyle mgh + \frac{1}{2}mv^2 = mgh + \frac{1}{2}mv^2$

okwhen t=0

v=0

m=240000

h= I dont know what h is!!!! is this 1500??

When t=tv = 90 km/h (does this need changing to mph?)

m = 240000

h = 0?????

I also know the equation work = force*distance