Question

Shawn and his bike have a total mass of

50.9 kg. Shawn rides his bike 0.88 km in
16.3 min at a constant velocity.
The acceleration of gravity is 9.8 m/s2.
What is Shawn's kinetic energy?
Answer in units of J.

Answer 1

Shawn's kinetic energy is 20.6 J

Step-by-step explanation:

We know that kinetic energy is given by the formula
`(1/2)(mv^2)`

We are given mass(m) = 50.9kg and

distance ridden by bike = 0.88km which is equal to 880m and

time taken = 16.3 min which is equal to 16.3*60 seconds = 978seconds

Given velocity is constant which is

(v)=
`\frac{\text { distance }}{\text { time }}`

=
`(880)/(978)`

= 0.899
`ms^-^2`

Substituting the values we get kinetic energy (k) =
`1/2*(50.9 * 0.899^2)`

, k = 20.60 kg
`ms^-^2`

as 1J = 1 kg
`ms^-^2`

So, k = 20.60 kg
`ms^-^2` = 20.6 J