Question

A small block B is placed on another block A of mass 5 kg and length 20 cm. Initially, the block B is near the right end of block A (Figure 5−E3). A constant horizontal force of 10 N is applied to the block A. All the surfaces are assumed frictionless. Find the time that elapses before block B separates from A.

Answer 1

Answer:

The time that elapses before block B separates from A is 0.44s

Explanation:

Mass of block A, m = 5 kg

F = ma = 10 N

⇒a=10/5=2 m/s²

As there is no friction between A and B, when block A moves, block B remains at rest in its position.

Initial velocity of A u = 0  m/s

Distance covered by A to separate out,

s = 0.2 m

Using

s=ut+1/2at², we get:

0.2=0+1/2×2t²

⇒ t² = 0.2

⇒ t = 0.44 s

Answer 2

Explanation:

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