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Shawn and his bike have a total mass of
46.6 kg. Shawn rides his bike 2.1 km in
13.9 min at a constant velocity.
The acceleration of gravity is 9.8 m/s?.
What is Shawn's kinetic energy?
Answer in units of J.

Respuesta :

Hania12

Answer:

≅  147.73 J

Explanation:

[tex]K.E = \frac{1}{2} mv^{2}[/tex]

where m = mass of the object ( total mass of bike and Shawn in this case)

           v = velocity of the object

First let's find the velocity of Shawn in SI units.

Velocity = Displacement traveled /  time taken

Displacement = 2.1 km = 2.1 × 1000 m = 2100 m

Time taken = 13.9 min = 13.9 × 60 s =834 s

Velocity = 2100 m/834 s ≅ 2.52 m/s

By applying it the equation [tex]K.E = \frac{1}{2} mv^{2}[/tex],

Kinetic energy ≅ 147.73 J

Please note that acceleration of gravity is not required and unit conversion was done to get the answer in J, the SI unit of energy.

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