Answer:Both balls have momentum to start,and they share it after collision
Explanation:both balls have momentum to start and they share it after collision
Answer:
The velocity of the police car is, v = 17.798 m/s
Explanation:
Given data,
The actual frequency of the siren, f = 2010 Hz
The observed frequency of siren is, f' = 2120 Hz
The velocity of the observer, v' = 0 m/s
The velocity of the source, v = ?
The formula for Doppler effect,

Where,
V - velocity of sound waves in air.

Substituting the given values,

v = 17.798 m/s
Hence, the velocity of the police car is, v = 17.798 m/s
Answer:
1.000000×10−7 Joules
Explanation:
Just search the internet.
Answer:
1st box: increase
supporting evidence: As the girl swings downward she will gain more height due to the increasing force pushing her
2nd box: increase
supporting evidence: the magnetic force of the earth will increase the kinetic energy of the girl when she goes downward slightly as she swings forward
3rd box :increase
supporting evidence:As the girl swings downward she will gain more speed due to the gravitational pull
Explanation: