Question

explain the formula -F=mv*v/r
m=mass of planet
v=its speed
r=its distance from sun

Answer 1

if an object is moving in a circular path the force applied centripetal (towards centre) and centrifugal (away from centre) on it , is mv^2/r .
where,
m-mass of the object
v-velocity of the object
r-radius of the circular path.
hope it helps.