As the box is moving with a constant velocity, the two forces acting on the box are canceling each other.
Then friction force = 80 Newtons but in the opposite direction.
Friction force = Mu * Normal force exerted by ground = Mu * weight of box
So we find Mu.
Mu = coefficient of friction between box and horizontal surface
= Force of friction / weight = 80 / 50 * 9.81 = 0.163
When an identical box is placed on top, the force of friction is
= Mu * total weight = 0.163 * (50+50) * 9.81 = 159.9 Newtons
Answer:40kg m/s
explanation: momentum =mass x velocity
D it causes more useful traits to be passed to offspring
Answer:
5m/s²
Explanation:
<em>acceleration= change in velocity divided by change in time</em>
<em>time= 3 seconds</em>
<em>Iv= 8 m/s north</em>
<em>Fv= 23 m/s north</em>
<em>change in velocity = 15 m/s</em>
<em>acceleration = 15 / 3 which equals 5 m/s²</em>
The answer is D
I say this because Global Warming is caused when Greenhouse gasses like carbon dioxide or carbon monoxide cumulate in the atmosphere trapping heat (or sunlight) in it instead of letting it bounce off Earth and go back into space, which causes the Earth to overheat