The energy released by the exploding gunpowder in a cannon propels the cannonball forward. simultaneously the cannon recoils. which has greater kinetic energy, the launched cannonball or the recoiling cannon?

The launched cannonball

Explanation:

Consider,

The mass of the cannonball, m

The mass of the cannon, M =  1000 m

The velocity of the cannon, V

The velocity of the cannonball, v = 100 V

The K.E of the cannon, K.E = ½ MV²

The K.E of the cannonball, k.e = ½ mv²

Substituting the values in the K.E of the cannon

                                     ½ MV² = ½ x 1000 m x (v/100² )

                                                 = ½ mv²/ 10

Therefore,                    ½ mv² = 10 x  ½ MV²

The K.E of the cannonball is 10 times the K.E of the cannon.

Hence, the cannonball has a grater K.E

3. dark matter

empty space could also be a simple vacuum