Question

A trolley T (mass 5 kg) on a horizontal smooth surface is pulled by a load L (2 kg) through a uniform rope ABC of length 2 m and mass 1 kg. As the load falls from BC = 0 to BC = 2m, its acceleration (in m s^–2) changes from -

(Take g = 10 m s^–2)

• A. 20/6 to 20/5
• B. 20/8 to 30/ 8
• C. 20/5 to 30/ 6
• D. none of these

Answer 1

Answer: (B)

20/8 to 30/ 8

Answer 2

Initially a = $\frac { 2 \times 10 } { 8 }$ = $\frac { 20 } { 8 }$

finally a = $\frac { 30 } { 8 }$