MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 x 1072 kg, moving with a speed of 4.20 x 105 m/s kg . m/s (b) a 12.5-g bullet moving with a speed of 345 m/s kg . m/s (c) a 75.5-kg sprinter running with a speed of 11.5 m/s kg . m/s (d) the Earth (mass = 5.98 x 1024 kg) moving with an orbital speed equal to 2.98 x 104 m/s. kg . m/s Need Help? Read It