Positive direction : bat swing
total momentum before = after
12(bat) + 0(ball) = 8(ball) + bat-after
bat-after is positive then direction is the same
This doesn’t mark any sense
Internal thermal energy is given as

so it will depend on the product of mass, specific heat capacity and temperature.
so here we know that both blocks are identical with same initial temperature
So the block with larger mass must have more internal energy
So here the correct answer would be the block with mass 1000g
block with mass 1000 g must have more internal energy
Object Falling from Rest. As an object falls from rest, its gravitational potential energy is converted to kinetic energy. Conservation of energy as a tool permits the calculation of the velocity just before it hits the surface. K.E. = J, which is of course equal to its initial potential energy.