A 1210 kg car is driving NE (at 45.0°) at 15.2 m/s when it is struck by a moving 1540 kg car. Afterwards, they stick together and move directly east (at 0°) at 23.3 m/s. What is the y-component of the second car's initial velocity?

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−21 newtons?

Aforce is a vector quantity because it has both?

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.