Question

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.​

Answer 1

Explanation:

distance of coconut from the grounds=15m

u=20

s

m

a=9.8

s

2

m

from

s=ut+

2

1

at

2

15=20t−

2

1

10t

2

3=4t−t

2

⟹t

2

−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