Solving second order differential equation with initial conditions and plotting

I am trying to solve using the dsolve function:

D^2y/dt + p(dy/dt) + 2y = cos(w*t) with the conditions y(0) = 0 and y'(0) = 0

Assuming p = 0 and w cannot be 0.

Also how would I go about plotting the solutions of y(t) vs t for different values of w such as 0.5,0.6,0.7,0.8,0.9 and 0.95

How do I go about doing this?

[Vaibhav Awale]

The question is already answered in the following post:

http://www.mathworks.com/matlabcentral/answers/271136-solve-second-order-differential-equation-with-initial-conditions?s_tid=answers_rc1