Question

If a body is thrown vertically upward and rises to a height of 10 m, then time taken by the body to reach the highest point is

• A. 1.043 s
• B. 1.43 s
• C. 1.024 s
• D. none of these

Answer 1

The correct option is B 1.43 s

Using the equation of motions
$v^2=u^2-2gh$
At maximum height , v = 0
$u^2=2gH$
$u^2=2\times 9.8\times 10$
$u^2=196$
$u=14m/s$
$v=u-gt$
$t=\frac{u}{g}$
$t=\frac{14}{9.8}$
$=1.43s$