Hello, can someone please help me with these three physics problems I don’t understand any of them.

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.

Why is no-till farming more sustainable than many traditional methods of farming

Five renewable energy resources are wind, sunlight, moving water and geothermal energy. question 2 options: true false