Kinetic energy is the energy of motion. If any object is
moving, rotating that object contains kinetic energy. This tutorial we will
briefly go through the kinetic energy basic questions. Importantly kinetic energy
is scalar quantity, which means it does not have direction.

Equation: Kinetic Energy
= ½ * Mass of the Object * (Velocity)

^{ 2}^{}

^{ }

**E = ½ MV**

^{2}

^{}**The unit of Kinetic Energy = J (Joule) =**

**kg * (m/s)**

^{ 2}

^{}
Questions

- Object
“P” has Mass of 60 kg and velocity (speed) 120 ms
^{-1}at point A. what is the kinetic energy at point A?

- When object “P” moves to it has a Kinetic energy of 6000J, what is the velocity of the object “p” at point B?

- Then
in point C Object “P” moves in vertical direction with 20 ms-
^{1}speed. What is the kinetic energy of object “p”? In which direction?

- Object
P has a kinetic energy of 200J and object Q has a kinetic energy of 100J.
Object Q has a velocity of 5 ms
^{-1}. Object P’s mass is twice of the Object Q’s mass. What is the velocity of object P?

Answers

1. Applying, E = ½ MV

^{2 }at point A^{}
E = ½ * 60 * (120)

^{2}
E = 432000 J =

*432 kJ*
2. Applying, E = ½ MV

^{2 }at point B^{}
6000 = ½ * 60 * V

^{2}
V =

*14.14 ms*^{-1}
3. Applying, E = ½ MV

^{2 }at point C
E = ½ * 60 * (20)

^{2}
E = 12000 J =

*12 kJ*
As kinetic energy is a scalar quantity, which don’t have
direction.

4.

Applying, E = ½ MV

^{2 }for^{ }Object P
200 = ½ * m

_{p}* V_{p}^{2 ------------------------}A
Applying, E = ½ MV

^{2 }for^{ }Object Q
100 = ½ * m

_{q}* 5^{2 ------------------------}B^{}
Given that,

2 m

_{q = }m_{p }^{------------------------}C
From above 3, A/B

2 = (m

_{p}/ m_{q) * }(V_{p}^{2}/^{ }5^{2 })^{------------------------}D
Applying (C) in above equation (D),

2 = (2 m

_{q }/ m_{q) * }(V_{p}^{2}/^{ }5^{2 })
V

_{p }=*5 ms*^{-1}### Share with Your Friends

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## 3 comments:

Thanks for sharing your thoughts. I truly appreciate your efforts and I am waiting for your next write ups thanks once again.

Pauleen

www.imarksweb.org

Its really a great fun to sol.these questions.....

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edupdf.org

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