A coconut is hanging on a tree at a height of 15 m from the ground. A body launches a projectile vertically upwards with a velocity of 20 m/s. After what time will the projectile pass by the coconut. Explain the two answers you get in this problem.
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Explanation:
distance of coconut from the grounds=15m
u=20sm
a=9.8s2m
from
s=ut+21at2
15=20t−2110t2
3=4t−t2⟹t2−4t+3=0⟹(t−1)(t−3)=0⟹t=1,3
at time t=1 second projectile passes the coconut by going upwards and t=3 seonds it passes the coconut coming downwards
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