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Momentum is mass multiplied by velocity. The momentum of the two ships would be 300 x 2 = 600 kgm/s and 300 x 1 = 300 kgm/s. So the combined momentum of the two ships would be 900 kgm/s.
there are 2.2 pounds in one kg 1200kgm = 2.2 x 1200 = 2640 pounds
car 1500 kilograms baseball 150 grams cars energy = 1/2 x 1500 x (10/3.6)2 = 5,787 joules baseballs energy = 1/2 x 0.15 x (150/3.6)2 = 130 joules (i worked it out for energy then noticed it said momentum) car = 1,500 x 10/3.6 = 4,166.67 kgm/s baseball = 0.15 x 150/3.6 = 6.25 kgm/s the car
p = m . v p = 10 * 25 = 250 kgm/s
to get weight multiply by acceleration of gravity which is 9.81 m/s/s. 5 x 9.81 = 49.05 kgm/s/s = 49.05 Newtons