Question

Two masses 2 kg and 4 kg are tied at the ends of a mass less string and which is passing over a friction-less pulley. The tension in the string is – 

(a) 3.68 N 

(b) 78.4 N

(c) 26 N 

(d) 13.26 N

Answer 1

(c) 26.13 N

Tension in the string T = \(\frac{2m_1m_2}{(m_1 + m_2)g}\) g 

T =\(\frac{2 \times 2 \times 4}{2 +4}\) x 9.8 = \(\frac{16}{6}\)x 9.8 = 26.13 N