Work Energy And Power Question 164

Question: If a skater of weight 3 kg has initial speed 32 m/s and second one of weight 4 kg has 5 m/s. After collision, they have speed (couple) 5 m/s. Then the loss in K.E. is [CPMT 1996]

Options:

A) 48 J

B) 96 J

C) Zero

D) None of these

Show Answer

Answer:

Correct Answer: D

Solution:

Loss in K.E. = (initial K.E. - Final K.E.) of system 12m1u12+12m2u2212(m1+m2)V2

=123×(32)2+12×4×(5)212×(3+4)×(5)2 = 986.5 J



NCERT Chapter Video Solution

Dual Pane