A 6 kg sled is sliding across a frictionless horizontal surface at 9 m/s when suddenly a 12 kg blob of snow falls vertically down on it. What is the new speed of the sled?​

The ideal gas model is valid if which of the following conditions is true? the gas density is low. the gas density is high. the temperature is low. the temperature is high. the gas density and the temperature are low. the gas density and the temperature are high. the gas density is high and the temperature is low. the gas density is low and the temperature is high.