Question

Name:

PTHW 3.1
(linear) Kinetic Energy and Wor
Per:
1.a. A bicycler has a mass of 80. kg. He pedals the bike 100 m in 20 seconds. What is
his kinetic energy (KE;)?
Given, Unknown:
Equation, Substitute:
Solution:​

Answer 1

Kinetic energy is 1000 J.

Step-by-step explanation:

Given:

Mass of the bicycle,
`m=80\textrm{ kg}`

Distance traveled,
`d=100\textrm{ m}`

Time of travel,
`t=20\textrm{ s}`

Unknowns:

Speed of the bicycler,
`v`.

Kinetic energy of the bicycler.

Equation:

Speed of the bicycler is,
`v=(d)/(t)=(100)/(20)=5\textrm{ m/s}`

Therefore, the kinetic energy of the bicycler is given as,

`KE=(1)/(2)mv^(2)`

Substitute:

Plug in 5 m/s for
`v` and 80 kg for
`m`. Solve for KE.

Solve:

`KE=(1)/(2)* 80* (5)^(2)\\KE=40* 25=1000\textrm{ J}`

Therefore, his kinetic energy is 1000 J.