2,450 Joules, kinetic energy is 1/2 mass x velocity squared.
The list of choices you gave us doesn't have any true statements on it.
Answer:
0.51
Explanation:
m = Mass = 70 kg
g = Acceleration due to gravity = 9.81 m/s²
t = Time taken
u = Initial velocity = 80 km/h = 80/3.6 = 22.22 m/s
v = Final velocity
a = Acceleration
s = Displacement = 50 m
Kinetic coefficient of friction between the road and the crate is 0.51
<span>Young modulus E = stress/strain where E is the elastic modulus. We seek to calculate the the strain.
But we would have to get the stress first. Tensile stress = Force/Area. Force = 20100N. And the Area = 9.54* 13.9 = 132.606Nm^2.
Strain = stress/E.where E = 79. Hence we have 132.606/79 = 1.67</span>
Density = mass /volume= 1000/100= 10 kg/m'3