What is the net force acting on a 0.15-kg hockey puck accelerating at a rate of 12 m/s2

Assuming f=ma
f= 0.15 x 12
f = 6n

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

The correct answer is "atomic weight".