[SDL] Delta time?

[L-28C]

Hello people of SDL!

I've been capping the framerate in my games the last few times, but I 
want to give delta time a try... Here's the code I have modified to work 
with DT:

-----------------------
	oldTime = SDL_GetTicks();
	
	while (1)
	{
		newTime = SDL_GetTicks();
		delta = newTime - oldTime;
		
		/* Update control status */
		handleControls(controls);
		
		/* TODO: Pause, not exit */
		if (controls[K_PAUSE]) exit(0);
	
		/* Process game logic */
		doLogic(delta);
	
		/* Render our scene */
		renderBackground();
		render(0);
		
		/* So we don't use 100% CPU */
		SDL_Delay(1);
		
		oldTime = newTime;
	}
-----------------------

In doLogic(), what I had done while capping FPS was add 0.05f to the 
ball's speed (acceleration) and multiply by 0.99f (deceleration).

But how would I modify those values to work with my delta?

Thanks!