A 10 kilogram cart is moving 5 m/s toward a motionless cart of unknown mass. The two carts collide, sending the second cart moving 6 m/s while the first cart slows to 3 m/s. What is the mass of the unknown cart? Show all work, including the equation and substitution with units

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.