A cart of mass m moving right at speed v with respect to the track collides with a cart of mass 0.7m moving left.
What is the initial speed of the second cart if after the collision the carts stick together and stop?
Express your answer in terms of some or all of the variables m and v.

Luke and carrie are driving down a straight section of the interstate at 70 mph in luke's new convertible. carrie is drinking a soda in the passenger seat. when she is done she tosses the bottle straight up in the air, just above the height of the car. what will happen to the bottle if air resistance is neglected? a. the bottle will land in carrie's lap. b. not enough information is given. c. the bottle will land on the interstate in front of the car. d. the bottle will land on the interstate behind the car.

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is