4. A 24 kg cart A and a 16 kg cart B are connected by a spring. The spring pushes them off in each direction with cart A moving at 5 m/s. What is cart B's speed?

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

Can give more details  

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.