G Problem 5. A 100 g firecracker is launched vertically into the air and explodes into two pieces at the peak of its trajectory. If a 72 g piece is projected horizontally to the left at 20 m/s, what is the speed and direction of the other piece

Explanation:

At the peak , velocity of firecracker = 0

It splits into mass of m₁ = 72 g and m₂ = 28 g

Applying conservation of momentum laws

m₁ v₁ = m₂v₂

72 x 20 = 28 x v₂

v₂ = 51.43 m / s .

It will go opposite to  other piece to conserve momentum ie to the right direction.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle