Jawabanmu

2014-08-24T16:05:54+07:00
Ry =   \int\(20-10t)dt m
Ry = (20t-5t²+c) m
R0 = 20x0-5x0²+c = 1
c=1
Ry = (20t-5t²+1) m
R2 = 20x2-5x2²+1 m = 40-20+1 = 21m