A 1350kg car travelling at 72km/h collides with a slow-moving car of mass 1650kg, also initially travelling south. After the collision, the velocity of the 2 cars together is 24km/h. Determine the initial velocity at which the second car was travelling.
vi1 = 72km/h=20m/s
vf1 = 24km/h=6.6666666m/s
The Attempt at a Solution
My answer was right except for the negative sign. Does the negative sign mean I did something wrong, because I didn't put negative signs infront of the velocity values in my calculations to indicate direction. What did I do wrong?
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