Ugggh physics about velocity?
A 90 kg halfback is running north at a speed of 10 m/s when he is tackled by a 120 kg opponent running south at 4 m/s. Could you help me calculate the velocity of both players just after the tackle?
2 Answers
Assume that at tackle time they Stick TOGETHER (don’t bounce apart) then northern
(call it negative -) momentum is
90 x 10= -900 kg.m/sec and momentum south is 120 x 4 = +480 kg.m/sec.
now momentum is additive and conserved so the combined mass of the two players is
(-900 +480)kg. m/sec =-420 kg m.sec.so the combined bodies will move in negative direction (which is NORTH at 420/210 =2m/second.
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