The body projected vertically with a speed of 25m/s. Then find the distance travelled by the body in 3rd second of its motion. g=10m/s2
1. 5m
2. 4m
3. 2.5m
4. zero

Asked by Mamali Nanda | 16th Jul, 2016, 08:00: AM

Expert Answer:

begin mathsize 14px style The space distance space travelled space by space the space body space in space the space tth space second space is
straight S subscript straight t equals straight u plus straight a over 2 open parentheses 2 straight t minus 1 close parentheses
Now comma space the space body space is space projected space vertically. space So comma space straight a equals negative straight g equals negative 10 space straight m divided by straight s squared
therefore straight s subscript 3 equals 25 minus 10 over 2 open parentheses 2 cross times 3 minus 1 close parentheses equals 25 minus 5 cross times 5 equals 25 minus 25 equals 0 space straight m
Hence comma space the space correct space answer space is space option space 4. end style

Answered by Romal Bhansali | 18th Jul, 2016, 12:03: PM