What organs are being affected from liver cancer and how?

Can someone explain to me how to do this problem ?

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

The slope of a velocity time graph over any interval of time gives the during that interval