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ASSIMILATION Determine whether the objects in the following problems have kinetic or potential energy. Then choose the correct formula to use: KE = 1/2 m V2 OR PE = mgh Show your complete solution and box your final answer

1. a 15 gram ball is rolling at 7 m/s.the ball has ________ energy

2 a 20 gram ball is held 4 meters from the ground. lt has _______energy .

3. you serve a volley ball with a mass of 1050g. the ball leaves your hand with a velocity of 15m/s . the ball has ______energy


please pa answer​

Sagot :

Tokamakidn

Problem 1:

The ball has kinetic energy.

Solution:

Note: 15 g = 0.015 kg

[tex]KE = \dfrac{1}{2}mv^{2}[/tex]

[tex]KE = \dfrac{1}{2}(\text{0.015 kg})(\text{7 m/s})^{2}[/tex]

[tex]\boxed{KE = \text{0.3675 J}}[/tex]

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Problem 2:

It has potential energy.

Solution:

Note: 20 g = 0.02 kg

PE = mgh

PE = (0.02 kg)(9.8 m/s²)(4)

[tex]\boxed{PE = \text{0.784 J}}[/tex]

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Problem 3:

The ball has kinetic energy.

Solution:

Note: 1,050 g = 1.05 kg

[tex]KE = \dfrac{1}{2}mv^{2}[/tex]

[tex]KE = \dfrac{1}{2}(\text{1.05 kg})(\text{15 m/s})^{2}[/tex]

[tex]\boxed{KE = \text{118.125 J}}[/tex]

[tex]\\[/tex]

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