A particle is thrown vertically up with a velocity of 100 ms-1 . What will be the time taken by the body to reach the ground? Assume g = 10 N .

Question

A particle is thrown vertically up with a velocity of 100 ms-1 . What will be the time taken by the body to reach the ground? Assume g = 10 N . (A)  5 s  (B)  10 s  (C)  15 s  (D)  20 s

Tardigrade Admin · Accepted Answer

At maximum height, v = 0 From v=u-gt ⇒ t=(u/g) =(100/10) =10 s Time of ascent = time of descent =10 s ∴ Flight time =10+10=20 s

Q. A particle is thrown vertically up with a velocity of $100 m s^{- 1}$ . What will be the time taken by the body to reach the ground? Assume $g = 10 N$ .

$5 s$

$10 s$

$15 s$

$20 s$

At maximum height, $v = 0$
From $v = u - g t$
$\Rightarrow t = \frac{u}{g}$
$= \frac{100}{10}$
$= 10 s$
Time of ascent = time of descent $= 10 s$
$∴$ Flight time $= 10 + 10 = 20 s$

Q. A particle is thrown vertically up with a velocity of 100ms−1 . What will be the time taken by the body to reach the ground? Assume g=10N .

5s

10s

15s

20s