3. A marble with 0.02 kg mass is moving towards right with a velocity of 20 cmys, makes a head on collision with a second marble with a mass of 0.02 kg which is moving towards left with a velocity of 10 cms. After collision the 1st marble moving towards left with a velocity of 10 CM/s, and what is the velocity of 2nd marble after collision?
10 cm/s Left
10 cm/s Right
20 cm/s Right
30 cm/s Right

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !