Question

Bird flying towards its nest with a mass of 0.25kg and a kinetic energy of 40.5j?

Answer 1

`18 m//s`

Explanation:

`KE = 1/2mv^2`

where

`KE` is kinetic energy in joules `J`

`m` is mass in kilograms `kg`

`v` is velocity in metres per second `m//s`.

i assume that you want to find the bird's average velocity, as that is the only quantity in the kinetic energy equation which is not mentioned.

here, `KE = 40.5J` and `m = 0.25kg`

`1/2mv^2 = 40.5`

`mv^2 = 81`

`m = 0.25`

`mv^2 = 0.25v^2 = 81`

`v^2 = 81 * 4 = 324`

`v = 18`

hence, the velocity `v` is `18 m//s`.