1) An object falls freely from rest on a planet where the acceleration due to gravity is 40 m/s/s. After 20 seconds it falls a distance of........................
2) It takes 15 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft
3) If a car increases it's velocity from zero to 100km/h in 10 seconds, its acceleration is.......
2) It takes 15 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft
3) If a car increases it's velocity from zero to 100km/h in 10 seconds, its acceleration is.......
-
1) ∆y=1/2*a*t^2 = 40*20^2/2 = 8 000 m
2) ∆y=1/2*g*t^2 = 9.81*15^2/2 = 1 103.625 m
3) v = a*t => a = v/t = 100/10 = 10 km/h^2 = 277 m/s^2
2) ∆y=1/2*g*t^2 = 9.81*15^2/2 = 1 103.625 m
3) v = a*t => a = v/t = 100/10 = 10 km/h^2 = 277 m/s^2