Answer:
25.8m/s
Explanation:
KE = 1/2 mv^2.
KE = 11J, Velocity = 22m/s, mass =m
We don't have mass since it's unknown so we calculate for mass and use that to find the second part of the question.
So KE = 1/2mv^2
11J = 1/2 x m x (22)^2
11 = 1/2 x m x 484
11 = 242m
11/242 =m
M =0.045kg
So we solve the second part and find velocity if KE is 15J with mass 0.045kg
KE =1/2 mv^2
15J = 1/2 x 0.045kg x v^2
15J = 0.0225 x V^2
15J/0.0225kg = V^2
666.6 = V ^2
V= sqr root of 666.6
V = 25.8m/s
