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Q.

Two blocks of masses 0.2 kg and 0.5 kg, which are placed 22 m apart on a rough horizontal surface (μ = 0.5), are acted upon by two forces of magnitude 3 N each as shown in Fig. at time t = 0. Then, the time t at which they collide with each other is

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a

1 s

b

2s

c

2 s

d

None

answer is C.

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Detailed Solution

a1=F−f1m1=F−μm1gm1=10ms−2a2=F−μm2gm2=1 ms−2∴s=12arealt2=1210 + 1t2 ⇒  t = 2s
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Two blocks of masses 0.2 kg and 0.5 kg, which are placed 22 m apart on a rough horizontal surface (μ = 0.5), are acted upon by two forces of magnitude 3 N each as shown in Fig. at time t = 0. Then, the time t at which they collide with each other is