A body is dropped from a height of 39.2m. After it crosses the half distance, the acceleration due to gravity comes to an end. Then the body will hit the ground with a velocity of (Take g=9.8ms−2)
A
19.6m/s
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B
20m/s
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C
1.96m/s
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D
196m/s
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Solution
The correct option is A19.6m/s Height h=39.2m Also, u=0 and g=9.8m/s2 Now, from equation of motion ⇒v2=u2+2as
After crossing half distance, the acceleration due to gravity stops acting So h=39.22=19.6m