Eric throws a basketball straight up into the air. As it rises, which form of energy is increasing? A. elastic potential energy
2 answers:
Answer:
C) Gravitational potential energy
Explanation:
As ball is thrown upwards then we can say that speed of the ball will decrease as it will move upwards.
This is due to gravity which act opposite to the motion of the ball
So as the ball is thrown upwards the initial kinetic energy of the ball will start decreasing as it will move upwards
Here we also know that gravitational potential energy of the ball is given as
so as the ball start rising upwards the potential energy of the ball will increase
so here correct answer will be
C) Gravitational potential energy
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We know that the change in momentum is equals to the product of force and time that is impulse ( ). Therefore, we need to determine the value of that the water is in air by using the second equation of motion,
Here, u is initial velocity which is zero.
.
Thus, impulse
From Newton`s second law,
Therefore, impulse
Given, and
Substituting these values, we get
Change in momentum = impulse
.
Answer:
The horizontal component of the velocity is 188 m/s
The vertical component of the velocity is 50 m/s.
Explanation:
Hi there!
Please, see the figure for a graphic description of the problem. Notice that the x-component of the vector velocity (vx), the y-component (vy) and the vector velocity form a right triangle. Then, we can use trigonometry to obtain the magnitude of vx and vy:
We can find vx using the following trigonometric rule of a right triangle:
cos α = adjacent / hypotenuse
cos 15° = vx / 195 m/s
195 m/s · cos 15° = vx
vx = 188 m/s
The horizontal component of the velocity is 188 m/s
To calculate the y-component we will use the following trigonometric rule:
sin α = opposite / hypotenuse
sin 15° = vy / 195 m/s
195 m/s · sin 15° = vy
vy = 50 m/s
The vertical component of the velocity is 50 m/s.
