At its maximum height, the ball will have zero vertical velocity, so the ball's velocity at this point is exactly equal to its horizontal velocity.
At any time <em>t</em>, the horizontal component of its velocity is
<em>v</em> = (15 m/s) cos(40°) ≈ 11.49 m/s
so at the highest point of its trajectory, the ball has a velocity of about 11.49 m/s pointed in the positive horizontal direction.
<span>The answer is none. According to the first law of Newton, an object stays at the same speed in the same direction if there are not forces unbalancing the object. Without friction, the car would be moving forever, unless there is another force accelerating or stopping the car.</span>
Answer:
force
Explanation:
Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.
Answer:


ΔS= 10.66 J/K
Explanation:
Given that
For hot reservoir :
T₁= 500 K
For cold reservoir :
T₂= 300 K
Energy transfer ,Q= 8000 J
The entropy change for the Hot reservoir :



The entropy change for the cold reservoir :



The entropy for universe
ΔS=ΔS₁+ΔS₂
ΔS= - 16 + 26.66 J/K
ΔS= 10.66 J/K