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a ball is dropped from a height.if it takes 2 seconds to cross last 6 metres.find the height from which ball is dropped.

2 years ago

Answers : (1)

Arun
24742 Points
							
For last 6m distance travelled , s=6m
time=0.2s
initial velocity=?
a=g=9.8m/s2
s=ut+1/2at²
=6=u(0.2)+1/2 x 9.8 x0.2x0.2
6=0.2 u + 4.9 x 0.04
u=5.8/0.2
u=29m/s
For distance x, u=0m/s
v=29m/s [ because initial velocity will be final]
a=g=9.8m/s2
s= v²-u²/2a
=29²-0²/2x9.8
=29x29/19.6
s=42.05m
Total distance=42.05 +6=48.05 m
 
 
Regards
Arun
2 years ago
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