Question

A massless string and a spring connect two blocks A & B to each other. Block B slides over a frictionless inclined plane while block A slides over horizontal surface. Coefficient of friction between block A & horizontal surface is m = 0.2. At the instant shown blocks are moving with constant speed. Mass of block A and energy stored in spring are respectively. (g = 10 m/s²) -

• A. 5 kg, 1J
• B. 10 kg, 0.05 J
• C. 5 kg, 0.05 J
• D. 10 kg, 1J

Answer 1

Answer: (C)

5 kg, 0.05 J

Answer 2

2 g sin q = kx = m m_A g

m_A = & U = $\frac { 1 } { 2 }$ kx²