Question

A housefly with a mass of 0.00100 kilograms zooms through the room at a rate of 2.20 m/s. How much kinetic energy does it have?

Answer 1

KE = 1/2 m*v^2

0.00100*2.20^2

divide the total by 2

=0.00242

Answer 2

The correct answer to the question is
`2.42* 10^(-3)\ J` i.e the kinetic energy of the housefly is
`2.42* 10^(-3)\ J`

CALCULATION:

As per the question, the mass of housefly m = 0.00100 kg,

The speed of the housefly v = 2.20 m/s.

We are asked to calculate the kinetic energy of the housefly.

The kinetic energy of a body having mass m and moving with velocity v is calculated as -

Kinetic energy K.E =
`(1)/(2)mv^2`

Hence, the kinetic energy of the housefly is calculated as -

K.E =
`(1)/(2)mv^2`

=
`(1)/(2)* 0.00100* (2.20)^2\ Joule`

=
`0.00242\ J`

=
`2.42* 10^(-3)\ J` [ANS]

Here, joule ( J) is the unit of energy.

Hence, the kinetic energy of the housefly is
`2.42* 10^(-3)\ J`