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Enaqbz
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Homework Statement
Two spacecraft from different nations have linked in space and are coasting with their engines off, heading directly toward Mars. The spacecraft s are thrust apart by large springs. Spacecraft 1, with a mass of 1.9 x 10^4 kg, then has a velocity of 3.5 x 10^3 km/h at 5.1 degrees to its original direction. Spacecraft 2, whose mass is 1.7 x 10^4 kg, has a velocity of 3.4 x 10^3 km/h at 5.9 degrees to its original direction. Determine the original speed of the two craft when they were linked together.
m1 = 1.9 x 10^4 kg
v1 = 972 m/s
m2 = 1.7 x 10^4 kg
v2 = 944 m/s
2. The attempt at a solution
Pf1 = (1.9 x 10^4 kg)(972 m/s) = 1.8 x 10^7 Ns
Pf2 = (1.7 x 10^4 kg)(944 m/s) = 1.6 x 10^7 Ns
The initial momentum will be the parallel components of the final momentum, so
Pti = (1.8 x 10^7 Ns)(cos5.1) + (1.6 x 10^7 Ns)(cos5.9) = 3.4 x 10^7 Ns
v = (3.4 x 10^7 Ns)/(3.6 x 10^4 kg) = 944 m/s
I'm not sure of it at all, help appreciated.