1. Two small cars are connected by a spring of negligible mass. Both cars are moving in the positive direction at 2.5 m/s. Car A has a mass of 2.4 kg. The spring pushes the masses apart and, after the spring expands, Car A is moving
at 3.1 m/s in the positive direction and Car B is moving at 2.1 m/s in the positive direction. Assume the track to be
frictionless and horizontal and that there are no net forces external to the system.
A. What is the mass of Car B?
B. What was the impulse that acted on Car A?
C. What was the net work done on car A?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

Diego kicks a soccer ball from the end line. his fellow students time and mark the soccer ball as it moves down the field. the graph represents the ball's progress. based on the graph, during what time is the velocity constant and positive?