M1 past paper momentum question November 2003 Question 2 (Edexcel)? Watch

applestrudle
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A railway truck S of mass 2000 kg is travelling due east along a straight horizontal track with constant speed 12 m s–1. The truck S collides with a truck T which is travelling due west along the same track as S with constant speed 6 m s–1. The magnitude of the impulse of T on S is 28 800 Ns.

(a) Calculate the speed of S immediately after the collision.



I got 26.4
On the markscheme it says 28800= 2000(12-v) but isn't it supposed to be Ft= final momentum minus initial momentum . The markscheme says initial minus final right??? :confused::confused::confused:
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Sombrero
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Since it's a head on collision, magnitude of the velocity will decrease. Initial velocity > Final velocity. Hence change in momentum = initial - final.
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