As per this question the mass of canoe is given as 21 kg.
The canoe is floating downriver with a speed of 4 m/s.
We are asked to calculate the kinetic energy of the canoe.
The kinetic energy is the energy due to the motion of the body.
If a body has mass m and it moves with a velocity v ,then its kinetic energy is defined as
[tex]kinetic\ energy [K.E]=\frac{1}{2} mv^{2}[/tex]
we are given v= 4 m/s and m= 21 kg
Hence kinetic energy of canoe [tex]K.E= \frac{1}{2} *21 kg [4 m/s]^{2}[/tex]
=168 Joule.
Hence the kinetic energy of the particle is 168 Joule.
Here Joule is the unit of energy
