In the previous problem, the time taken to reach the maximum height will be decreased by:

Options

A. `19%`
B. `5%`
C. `10%`
D. none of these

Answer

d

Explanation

`t=(u sin theta)/g`
`t'=(u sin theta)/(g')=(u sin theta)/((11g)/10)=10/11t`
% decreases in `t=(t-t')/txx100`
`=(1-10/11)xx100=9%`