A 45-kg football player is running at 7 m/s when he collides with a 55-kg player at rest. Their bodies get tied up after the collision, and they slide across the field at the
same speed. What speed are they moving right after the collision?
3.15 m/s
3.85 m/s
5.7 m/s
8.6 m/s

Answermake them get very hot and over time wear them out;

Electrical charge is measured in coulomb.(c). the amount of an electrical charge that moves in a circuit depends on the current flow and how long it flows for. a current of 10 a flows for 30 s,then 10 x=300 coulombs of electrical charge moves

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.

Not to sure maybe the strength of the magnetic field decreases