Answer to Question #286446 in Physics for Maggie

Question

A robin of mass 110g speeds up from 12.3 m/s to 15.4 m/s in level flight. Calculate how much work is done by the robin on its mass

Answer 1

The work done is

$$W=\Delta KE=\dfrac12mv_2^2-\dfrac12mv_1^2=4.7\text{ J}.$$