A block of mass m is dropped from height h above the ground. Find out the speed of the block when it reaches the ground.

Explanation

Figure shows the complete description of the problem only one conservative force is working on the block. So from mechanical energy conservation
`k_(f)+ u_(f) = k_(i) + u_(i)`
`rArr " " (1)/(2) mv^(2) + 0 = 0 +` mgh
v = `sqrt(2gh)` m/sec