after a ball has been falling under gravity for 5 sec it passes throught a piece of glass and losses half its velocity.if it now reaches the ground in 1sec find the height of the glass above the ground.use(g=9.8m/s squ.)
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v = v0 + gt
= 0 + (9.8m/s²)(5.0s)
= 49m/s
After breaking through the glass, its speed has been reduced to roughly half this: 25m/s. If it takes 1.0s to reach the ground with that speed, then the height of the glass was:
Δy = v0t + 0.5gt²
= (25m/s)(1.0s) + 0.5(9.8m/s²)(1.0s)²
= 30m (rounded
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