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Question: If mass of \(A = 10 \mathrm {~kg}\) , coefficient of static friction = 0.2, coefficient of kinetic f...

If mass of A=10 kgA = 10 \mathrm {~kg} , coefficient of static friction = 0.2, coefficient of kinetic friction = 0.2. Then mass of B to start motion is

A

2 kg

B

2.2 kg

C

4.8 kg

D

200 gm

Answer

2 kg

Explanation

Solution

μs=mBmA⇒0.2=mB10⇒mB=2 kg\mu _ { s } = \frac { m _ { B } } { m _ { A } } \Rightarrow 0.2 = \frac { m _ { B } } { 10 } \Rightarrow m _ { B } = 2 \mathrm {~kg}