a 10k-g rock and 20k-g rock are dropped from the same height and experience no significant air resistance. If it takes 20 k-g rock a time T to reach the ground, what time will it take the 10k-g rock to reach the ground

Which type of basaltic lava flow has a fairly smooth

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n