Centre of Mass 3 Question 22

25. The speed of the block at point C, immediately before it leaves the second incline is

(a) 120m/s

(b) 105m/s

(c) 90m/s

(d) 75m/s

(2008,4M)

Show Answer

Answer:

Correct Answer: 25. (b)

Solution:

  1. Height fallen by the block from B to C

h2=33tan⁡30∘=3m

Let v3 be the speed of block, at point C, just before it leaves the second incline, then :

v3=v22+2gh2=45+2×10×3=105ms−1

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