1. A car advertisement states that a certain car can accelerate from rest to 90km/h in 9 seconds. What is the car's average acceleration?

2.An eagle accelerates from 15m/s to 22m/s in 4 seconds. What is the eagle's average
acceleration?

3.At the starting line, a sprinter is traveling at 0 m/s before being told to go. Nine seconds
later, she is moving at 10 m/s. What is her acceleration?

4.A person sees a red light and applies his brakes. The speed of his car decreases from 100
km/hr to 0 km/hr in 2 seconds. What is his acceleration?

Answermuscle strength;

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.