Question

A small 21 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

answer =
units =

Answer 1

Hey there! :D

Kinetic Energy= 0.5*m*v^2

m= mass

v= speed

KE= 0.5*21*4^2

KE= 168

You use joules as the units.

So, 168 joules.

I hope this helps!
~kaikers

Answer 2

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

`kinetic\ energy [K.E]=(1)/(2) mv^(2)`

we are given v= 4 m/s and m= 21 kg

Hence kinetic energy of canoe
`K.E= (1)/(2) *21 kg [4 m/s]^(2)`

=168 Joule.

Hence the kinetic energy of the particle is 168 Joule.

Here Joule is the unit of energy