unable to plot about

Sir, I am unable to plot this velocity function . i want to see the variation of velocity with the ratio of (m/l) value of constant

A=10

H=67

m=0.008 to 0.2 or it may be constant m=0.1

l= 0.6 to 0.8

tau=150

alpha=0.3

[madhan ravi]

what have you tried it sounds homework???