Question

Figure (8-E7) shows a spring fixed at the bottom end of an incline of inclination 37°. A small block of mass 2 kg starts slipping down the incline from a point 4.8 m away from the spring. The block compresses the spring by 20 cm, stops momentarily and then rebounds through a distance of 1 m up the incline. Find (a) the friction coefficient between the plane and the block and (b) the spring constant of the spring. Take g = 10 m/s ².

Comments

But as friction is not a conservative force law of conservation cannot be applied.

Answer 1

m = 2kg, s₁ = 4.8m, x = 20cm = 0.2m, s₂ = 1m,
sin 37° = 0.60 = 3/5, θ = 37°, cos 37° = .79 = 0.8 = 4/5
g = 10m/sec²
Applying work – Energy principle for downward motion of the body