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jeka57 [31]
3 years ago
6

24 POINTS!!!!!!!!!!!!

Physics
2 answers:
Karo-lina-s [1.5K]3 years ago
3 0

Answer: Option (c) is the correct answer.

Explanation:

When the child is tossed up into the air then she gains kinetic energy as the child has moved from its initial position.

It is given that mass is 20 kg, velocity is 5 m/s^{2}, and height is 2 m.

Calculate the kinetic energy of child as follows.

             kinetic energy = \frac{1}{2}mv^{2}

                                      = \frac{1}{2}20 kg \times (5 m/s)^{2}

                                      = 10 kg \times 25 m^{2}/s^{2}

                                      = 250 kg m^{2}/s^{2}

Also, when child falls off the ground then she will have gravitational potential energy.

Calculate gravitational potential energy of child as follows.

            Potential energy = m × g × h

                                         = 20 kg \times 9.8 m/s^{2} \times 2 m

                                         = 392 kg m^{2}/s^{2}

Marta_Voda [28]3 years ago
3 0
The child has kinetic energy (KE) because she's moving, and gravitational potential energy (GPE) because she's off the ground.
KE = 1/2mv²
KE = 1/2 (20 kg)(5 m/s)²
KE = 50 J

Ug (gravitational potential energy) = mgy
Ug = (20)(9.8)(2) = 392 J

Make sense? Need anything else?
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Vinil7 [7]

Answer:

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4 0
3 years ago
The Special Olympics raises money through "plane pull" events in which teams of 25 people compete to see who can pull a 74,000 k
Murrr4er [49]

Answer:

28716.4740661 N

1.2131147541 m/s

51.2474965841%

Explanation:

m = Mass of plane = 74000 kg

s = Displacement = 3.7 m

f = Frictional force = 14000 N

t = Time taken = 6.1 s

u = Initial velocity = 0

v = Final velocity

s=ut+\frac{1}{2}at^2\\\Rightarrow 3.7=0\times 6.1+\frac{1}{2}\times a\times 6.1^2\\\Rightarrow a=\frac{3.7\times 2}{6.1^2}\\\Rightarrow a=0.198871271164\ m/s^2

Force is given by

F=ma+f\\\Rightarrow F=74000\times 0.198871271164+14000\\\Rightarrow F=28716.4740661\ N

The force with which the team pulls the plane is 28716.4740661 N

v=u+at\\\Rightarrow v=0+0.198871271164\times 6.1\\\Rightarrow v=1.2131147541\ m/s

The speed of the plane is 1.2131147541 m/s

Kinetic energy is given by

K=\dfrac{1}{2}mv^2\\\Rightarrow K=\dfrac{1}{2}\times 74000\times 1.2131147541^2\\\Rightarrow K=54450.9540448\ J

Work done is given by

W=Fs\\\Rightarrow W=28716.4740661\times 3.7\\\Rightarrow W=106250.954045\ J

The fraction is given by

\dfrac{54450.9540448}{106250.954045}=0.512474965841

The teams 51.2474965841% of the work goes to kinetic energy of the plane.

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Answer:

2.902 to 3 decimal places

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