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Standard IX

Physics

Weight and Mass

Two blocks ...

Question

Two blocks $A$ and $B$ of masses $8 k g$ and $2 k g$ 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

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3.0 N

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4.5 N

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6.0 N

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Solution

The correct option is B $3.0 N$
$F_{n e t} = M a_{n e t}$
$15 = 10 \times a \Rightarrow \frac{15}{10} = a \Rightarrow a = 1.5 m / s^{2}$
$15 - N = m a$
$! 5 - N = 8 \times 1.5$
$15 - 12 = N$
$N = 3.0 n$

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

The correct option is B 3.0NFnet=Manet15=10×a⇒1510=a⇒a=1.5m/s215−N=ma!5−N=8×1.515−12=NN=3.0n

Two blocks $A$ and $B$ of masses $8 k g$ and $2 k g$ 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

The correct option is B $3.0 N$
$F_{n e t} = M a_{n e t}$
$15 = 10 \times a \Rightarrow \frac{15}{10} = a \Rightarrow a = 1.5 m / s^{2}$
$15 - N = m a$
$! 5 - N = 8 \times 1.5$
$15 - 12 = N$
$N = 3.0 n$