Work Energy And Power Question 207
Question: A 10 kg block is pulled in the vertical plane along a frictionless surface in the form of an arc of a circle of radius 10 m. The applied force is of 200 N as shown in figure. If the block had started from rest at A, the velocity at B would be
Options:
A) 1.7 m/s
B) 17 m/s
C) 27 m/s
D) 34 m/s
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ W _{gravity}+W _{F}=\Delta K $
$ -10\times g( 10-10cos60{}^\circ )+200\times 10sin60{}^\circ $
$ =\frac{1}{2}\times 10\times v_f^{2}-0~\therefore v _{f}=17m/s $
