| A block mass m is kept on a platform which starts with constant acceleration g/2 upward, as Work done by normal reaction on block in time t is: |
 |
A) \[-\frac{m{{g}^{2}}{{t}^{2}}}{8}\]
B) \[\frac{m{{g}^{2}}{{t}^{2}}}{8}\]
C) 0
D) \[\frac{3m{{g}^{2}}{{t}^{2}}}{8}\]
Correct Answer: D
Solution :
\[W=F\,s\,\cos \theta \] \[=m\left( g+\frac{g}{2} \right)\times \left[ \frac{1}{2}\times \frac{g}{2}\times {{t}^{2}} \right].\]
You need to login to perform this action.
You will be redirected in
3 sec
