A 600-kg car makes a 90 turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?
A) 19.1 103 kgm/s
B) 10.2 103 kgm/s
C) 9.55 103 kgm/s
D) 12.0 103 kgm/s
E) 22.2 103 kgm/s
Question 2
The driver of a motorboat that can move at 10 m/s in still water wishes to travel directly across a river in which the current flows at 5.0 m/s.
(a) At what angle, measured from the upstream direction, should the driver head the boat? (b) How many minutes will it take to cross the river if it is 1.6 km wide at that point?
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