A cannon has a mass of 219 kg and is loaded with a cannonball of 20 kg. It is initially stationary. When fired the cannon has a recoil velocity equal to -6. 2 m/s to the left. What must be the velocity of the cannonball?.

Which planet do you think would be easiest for humans to colonize some day?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m

Suppose astronomers built a 140-meter telescope. how much greater would its light-collecting area be than that of the 10-meter keck telescope? express your answer using two sign