//Mass of the tennis ball(in grams):
m=57;
//Diameter ofthe ball (in mm):
D=64;
//Velocity with which te ball is hit(in m/s):\
V=25;
//Topspin given on the ball(in rpm):
N=7500;
//Acceleration due to gravity(in m/s^2):
g=9.81;
//Kinematic viscosity(in m^2/s):
v=1.46*10^-5
//Desity of air(in kg/m^3):
d=1.23;