Answer:
mass: The quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement.
Explanation:
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The answer is 3.
When a ball is thrown into the air, there is no friction (there's nothing rubbing against it), so the only force acting on the ball is gravity, which aims to pull the ball back down. Since this is the only force, the answer will equal the gravity acting on the ball. Since "weight" is defined as just that (the gravity acting on something), the answer is 3, the magnitude of the rock's weight (or the force of gravity).
I believe the answer is Medicine. Applied science is defined as applying already known science to create things such as inventions. In order to create medicine, we need to already understand biology.
Use conservation of momentum.
Initial momentum = 0
Final momentum = momentum of the girl + momentum of the boy = inifial momentum = 0.
Momentum of the girl = - momentum of the boy
mass of the girl * velocity of the girl = - mass of the boy * velocity of the boy
50 kg * velocity of the girl = - 80 kg * 3m/s
=> velocity of the girls = -80 kg * 3m/s / 50 kg = - 4.8 m/s
Answer: - 4.8 m/s
