1. Use reasoning to determine if one of the following objects in each of these pairs has a greater value for the magnitude of its momentum than the other. ( no calculations should be required.)
a) a 900-kg truck travelling at 60 km/h or a 500-kg car travelling at 60 km/h.
b) a 15 kg object travelling to the right at 5 m/s or a 15 kg object travelling to the left at 5 m/s.
c) a 900-kg truck at rest or a mosquito flying at 2 m/s.
d) a 20 N ball travelling at 5 m/s on a planet where the gravitational acceleration is 2 m/s^2 or a 20 N ball travelling at 5 m/s on a planet where gravity acceleration is 4 m/s^2.