A classical mechanics problem by Sandra Mounir Philippe
Classical Mechanics
Level
1
A ball falls from a height of , neglecting air resistance, estimate its speed when it hits the ground.
137.2
11,713
443,7
46.8
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1 solution
We know that, v^2=u^2+2gh ( g is acting downwards, so it is +ve) Here, g=9.8 ms-1 h= 7m & u= 0 ms-1 ( the ball falls from a stationary condition )
so we have, v^2= 0 + 2 x 9.8 x 7 = 137.2 therefore, v= 11. 713 ms-1