Using the sliders, kadia sets the initial velocity of ball 1 to +20 m/s, and the initial velocity of ball 2 to −20 m/s. she sets the masses of both balls equal to 1 kg. because this is a perfectly inelastic collision, the balls will stick together after colliding. she clicks "start" to begin the simulation. what can she say about what she observed? "the two balls collided and moved together to the left." "the two balls collided and stopped." "the two balls moved in opposite directions." "the two balls collided and moved together to the right."