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.

≅  147.73 J

Explanation:

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 ,

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.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.