Question

A particle of mass m has speed v = c/x, where c is a constant and x is the displacement. At t=0, x=

x Find the force

a) F(x)

b) F(t)

Answer 1

$F=ma=m\dot v=-\frac{mc}{x^2},$

a)

$F=-\frac{mc}{t^2},$

b)

$F=-\frac{mc}{x^2}.$