how do you do this
the motion of a ball on an inclined plane is described by th eequation delta x =1/2 a(delta t)^2.
which of the following quantities must have a value of zero?
a. Xi
b. Xf
c. Vi
d. Tf
:)
v = Vi + a t
x = Xi + Vi t + (1/2) a t^2
if Delta x = x - Xi
x - Xi = Vi t + (1/2) a t^2
so
Vi must be zero