Work Energy And Power Question 251

Question: A straight bar, of mass 15 kg and length 2 m, at rest on a frictionless horizontal surface, receives an instantaneous impulse of 7.5 Ns perpendicular to the bar. If the impulse is applied at the mid-point of the bar, the energy transferred is

Options:

A) 3.2 J

B) 1.9J

C) 3.8 J

D) 2.5 J

Show Answer

Answer:

Correct Answer: B

Solution:

[b] $ J=m( v _{f}-v _{i} )or7.5=15( v _{f}-0 ) $

$ \Rightarrow v _{f}=0.5m/s $

$ \therefore ~~K=\frac{1}{2}mv^{2}=\frac{1}{2}\times 15\times {{0.5}^{2}}=1.9J $



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