#### Answer

$2m/s^{2}$

#### Work Step by Step

Mass of first block =$\frac{F}{a}=\frac{40N}{2.5m/s^{2}}=16kg$
Mass of second block =$4kg$
Combined mass$=16+4=20kg$
So, acceleration of combined mass $=\frac{40N}{20kg}=2m/s^{2}$

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Published by
Pearson

ISBN 10:
0-32160-183-1

ISBN 13:
978-0-32160-183-4

$2m/s^{2}$

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