Answer:
4.168 J
Step-by-step explanation:
Applying the formula of kinetic energy,
Ek = 1/2mv²..................... Equation 1
Where Ek = Kinetic energy of the spike, m = mass of the spike, v = initial velocity of the spike
Given: m = 0.77 kg, v = 3.5 m/s.
Substitute into equation 1
Ek = 1/2(0.77)(3.5²)
Ek = 4.72 J.
From the question, if the tie and the spike together absorb, 88.3 percent of the spike's initial kinetic energy.
Ek' = 88.3/100(4.72)
Ek' = 4.168 J