Answer:
The dimensional formula of Young's modulus is [ML^-1T^-2]
Answer: A pendulum is an object hung from a fixed point that swings back and forth under the action of gravity.
Example: playground swing
The object has been golaced in water
Answer:
THEY WOULD FIND DED FISH:)))))
Explanation:
Wee can use here kinematics
as we know that

for shorter tree we know that


now since we know that other tree is twice high
So height of other tree is y = 39.2 m
now again by above equation



so the time taken is 2.83 s