Answer:
a. 1.5 m/s
Step-by-step explanation:
We will apply the law of conservation of energy in this situation between the initial position and the lowest point of the swing:
where,
m₁ = mass of ball = 1.6 kg
m₂= mass of block = 0.8 kg
u₁ = initial speed of ball = 0 m/s
u₂ = initial speed of block = 0 m/s
v₁ = final speed of ball = ?
v₂ = final speed of block = 3 m/s
Therefore,
v₁ = 1.5 m/s
Therefore, the correct option is:
a. 1.5 m/s