Three cannons are arranged as shown below so that they shoot identical balls sim

Question

Three cannons are arranged as shown below so that they shoot identical balls simultaneously with the same initial speed v from the same height. Which one reaches the ground below first? (Ignore air resistance.) Ball A Ball B Ball C All of them hit simultaneously. Not enough information is given. Three cannons are arranged as shown below so that they shoot identical balls simultaneously with the same initial speed v from the same height. Which one has the greatest kinetic energy when it hits the ground? (Ignore air resistance.) Ball A Ball B Ball C All of them hit simultaneously. Not enough information is given.

Explanation / Answer

15)
All of them as initial vertical component of velocity = 0
time taken to reach depends on the vertical compoenent

So, all will reach ground at the same time

Answer: All of them hit simultaneously

16)
initial kinetic energy is same for all which is 0.5*m*v^2
decrease in potential energy = mgh will be same for all
hence final kinetic energy will be same for all
Answer: All of them have the same kinetic energy

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