Question

A 20 kg block is connected to a 30 kg block. A force of 50 N pulls the blocks to the right as shown in figure. Find the magnitude of acceleration of 30 kg block.

• A. $0.5m{s}^{-2}$
• B. $1m{s}^{-2}$
• C. $2m{s}^{-2}$
• D. $5m{s}^{-2}$

Answer 1

The correct option is B $1m{s}^{-2}$

When 50 N Force pulls the blocks , both will accelerate with the same acceleration as they are connected with a string.

so, considering the whole system,

$F=ma$

$50=(20+30)a$

$a=1m{s}^{-2}$