Answer:
3 kg
Explanation:
Momentum before = momentum after
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
After jumping on the skateboard, the student and the skateboard have the same velocity, so v₁ = v₂.
m₁u₁ + m₂u₂ = (m₁ + m₂) v
(47.4 kg) (4.2 m/s) + m (0 m/s) = (47.4 kg + m) (3.95 m/s)
m = 3 kg
A wave is a perturbation in a material from the point the perturbation was produced, to the sorrounding area
Answer:
Yes.
Explanation:
Sound waves travel through metal 17 times faster than air.
Yes
The earthquakes in the san andrais fault line are one of the most dangerous.
