SATHEE: Centre of Mass 1 Question 9

Centre of Mass 1 Question 9

9. Two blocks of masses $10 k g$ and $4 k g$ are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of $14 m / s$ to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

(2002, S)

(a) $30 m / s$

(b) $20 m / s$

(d) $5 m / s$

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Answer:

Correct Answer: 9. (c)

Solution:

$\begin{aligned} ⟶ v_{1} = 14 m / s \end{aligned}$

$\begin{aligned} v_{C M} = \frac{m_{1} v_{1} + m_{2} v_{2}}{m_{1} + m_{2}} = \frac{10 \times 14 + 4 \times 0}{10 + 4} = \frac{140}{14} = 10 m / s \end{aligned}$

Centre of Mass 1 Question 9

9. Two blocks of masses $10 k g$ and $4 k g$ are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of $14 m / s$ to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

Answer:

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Centre of Mass 1 Question 9

9. Two blocks of masses 10kg and 4kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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9. Two blocks of masses $10 k g$ and $4 k g$ are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of $14 m / s$ to the heavier block in the direction of the lighter block. The velocity of the centre of mass is