A 2100 kg truck traveling north at 41 km/h turns east and accelerates to 51 km/h. (a) What is the change in the truck's kinetic energy? What are the (b) magnitude and (c) direction of the change in its momentum?
currently using delta P = mvf - mvi, but this is not working. i then tried p = mvcom, but this doesn't work either. please help.
The Attempt at a Solution
first converted the speeds to 11.39 and 14.17 m/s.
a) delta K = 74510 J. this is correct.
b) Pi = (2100)(11.39) = 23919 kg m/s
Pf = (2100)(14.17) = 29757 kg m/s
delta P = Pf - Pi = 5838 kg m/s. this is incorrect.
c) i have no idea how to do this either.