Newton's first law of motion states that an object that is resting (not moving) will stay motionless unless an external force acts on it and an object in motion will stay in motion unless an outside force acts on it. This law is known as newton's law of inertia.
Answer:
When a sound wave moves from water to air, the speed of the sound wave decreases.
Explanation:
This is because the transfer of motion that produces the wave.
Total energy before the toss:
Total energy at the roof:
Energy must be conserved so :
If v₁ is the initial velocity and v₂ is the final velocity, which is zero at the roof:
Because the two waves of the rope are inter twinted.
No because if there is a force, there is acceleration which means the object is getting faster.