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hjlf
3 years ago
6

To describe velocity, you need to know ____. (1 point)

Physics
2 answers:
kati45 [8]3 years ago
8 0
The correct answer that would best complete the given statement above would be the first option. <span>To describe velocity, you need to know speed and direction. When we say velocity, this is the speed of something in a given direction. To solve for velocity, its formula is similar to speed which is distance over time, and just include the direction. Hope this answer helps.</span>
son4ous [18]3 years ago
3 0
<span>To describe velocity, you need to know speed and direction of motion.</span>
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What is a satellite
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an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.

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Peak to peak value of voltage is
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a moving billiard ball collides with an identical stationary billiard ball in an elastic collision. after the collision, the sec
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A billiard ball collides with a stationary identical billiard ball to make it move. If the collision is perfectly elastic, the first ball comes to rest after collision.

<h3>Why does the first ball comes to rest after collision ?</h3>

Let m be the mass of the two identical balls.  

u1 = velocity before the collision of ball 1

u2 = 0 = velocity of second ball that is at rest

v1 and v2 are the velocities of the balls after the collision.

From the conservation of momentum,

∴ mu1 + mu2 = mv1 + mv2

∴ mu1 = mv1 + mv2

∴ u1 = v1 + v2

In an elastic collision, the kinetic energy of the system before and after collision remains same.

\frac{1}{2}  mu_1^2+0=\frac{1}{2}  mv_1^2+\frac{1}{2}  mv_2^2

∴  \frac{1}{2}  m(v_1+v_2 )^2=\frac{1}{2} mv_1^2+\frac{1}{2}mv_2^2

∴ \frac{1}{2} mv_1^2+\frac{1}{2} mv_2^2+mv_1 v_2=\frac{1}{2}  mv_1^2+\frac{1}{2} mv_2^2

∴ mv₁v₂ = 0

  1. It is impossible for the mass to be zero.
  2. Because the second ball moves, velocity v2 cannot be zero.
  3. As a result, the velocity of the first ball, v1, is zero, indicating that it comes to rest after collision.
<h3>What is collision ?</h3>

An elastic collision is a collision between two bodies in which the total kinetic energy of the two bodies remains constant. There is no net transfer of kinetic energy into other forms such as heat, noise, or potential energy in an ideal, fully elastic collision.

Can learn more about elastic collision from brainly.com/question/12644900

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Answer:

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