A car moving at 15 m/s north needs to stop in 100 m. What acceleration is required? Round answer to nearest whole number. a. + 2 m/s2
b. - 1 m/s2
c. 0 m/s2
d. -15 m/s2

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m