NTSE Stage 2 SAT 2017 Question Paper

Question : 32 of 100

Marks: +1, -0

Two blocks A and B of masses 8 kg and 2 kg respectively, lie on a horizontal frictionless surface as shown in the figure. They are pushed by a horizontally applied force of 15 N. The force exerted by B on A is

1.5 N
3.0 N
4.5 N
6.0 N

Validate

Solution:

acceleration of system

=\F/\m

=15/{8+2}=15/10

=1.5 \m \s^2

Force exerted by A and B = ma

=2×1.5=3\N

As a reaction B exerts 3N on A.

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