The Greenland ice sheet is thought to affect (or be affected by) climate in the North Atlantic and Europe, and is currently more than 100,000 years old. The sheet is of the order of 2400x1100 km in surface area and 2.5 km deep. If the energy imbalance to the sheet is such that it is getting a net of 250 watts/m2 energy coming in, how long will it take for it to melt

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?