3 part Q 3 part Q . A 150-g mass is pressed and held (unattachedy against a hori

Question

3 part Q

3 part Q

. A 150-g mass is pressed and held (unattachedy against a horizontal spring com pressing ir900-em. The spring constant is 400-N/m. After release, the mass slides 165-cm along a level surface before it comes to rest. 2pt 1 I. Find the speed that the mass has when the spring energy is zero. Il. What is the coefficient of friction (u) for the surface? [friction (mu) x normal force), Work eq ch5] III. Suppose the mass was pressed against the same spring in a vertical position. Upon release the mass erred.s fou the smaer imm abv the position where the spring

Explanation / Answer

Energy when the spring is relaxed = gravitational potential energy at the maimum height

KE = PE

(1/2)*m*v^2 = m*g*h

(1/2)*k*x^2 = m*g*h

h = k*x^2/(2*m*g)

h = 400*0.09^2/(2*150*10^-3*9.8)

maximum height h = 1.102 m <<<<<-----ANSWER

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