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**[SOLVED] Homework: Forces and Acceleration**

1.)

While chopping down his father's cherry tree, Anthony discovered that if he swung the axe with a speed of 25 m/s, it would embed itself 2.3 cm into the tree before coming to a stop.

a.) If the axe head had a mass of 2.5 kg, how much force was the tree exerting on the axe head upon impact?

>>>I know how to get the force but I still have to take into account the 2.3 cm of embedding the axe made to the tree. The answer will come out negative right?

F=MA

F=(2.5 kg)(9.8m/s^2)

F=24.5newtons

2.)

Jackson's favorite ride at Disneyland is the rollercoaster. The rollercoaster car and passengers have a combined mass of 1620 kg, and they descend the first hill at an angle of 45 degrees to the horizontal. With what force is the rollercoaster pulled down the hill?

>>> Again, I know how to find the force here, but the 45 degrees messes me up. Oh, but quick question, is the acceleration different here because what if the rollercoaster cable lines is a factor in the acceleration of the rollercoaster? Or is it still 9.8m/s^2??