hi I am new and new to physics i am have alot of trouble with this problem mass =1.3kg 41.5J how do i get the velocity so far i have it wrote like this 41.5J=1/2(1.3kg)(v)^2 but dont know how else to do plz help thanks ron
The equation KE=1/2mv^2 says that the kinetic energy is equal to half of the mass of the object times the object's velocity squared. So you need to solve for velocity (v). Isolate the v variable using algebra (try to get v by itself on one side of the equation).
You will find that it is easier to do your algebra BEFORE plugging in the numbers. You have [tex] \mbox{KE} = \frac 1 2 m v^2 [/tex] then [tex] 2 \mbox{KE} = m v^2 [/tex] then [tex] 2 \frac {\mbox{KE}} m = v^2 [/tex] so [tex] v = \sqrt { 2 \frac {\mbox{KE}} m } [/tex] Now you can substitute in your numbers and arrive at the numeric solution.
thank you for the help i have been out of school 24 years and this is my last semester for my degree thanks ron