A horizontal spring with spring constant 85 N/m N/m extends outward from a wall just above floor level. A 8.5 kg kg box sliding across a frictionless floor hits the end of the spring and compresses it 6.5 cm cm before the spring expands and shoots the box back out. How fast was the box going when it hit the spring?

How do we measure or think of speed in the united states?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?