Question

an object is thrown vertically upward from ground with a velocity of 20 m/s. in how much time it will hit the ground? (g=10 m/s2​

Answer 1

Explanation:

here u=20m/s,v=0,g=10m/s²

now the equation is v=u+at

0=20+10*t

-20=10*t

t=-20/10

t=-2s

there fore time taken to hit the ground is -2s

Answer 2

Answer:

answer is 4seconds

Explanation:

given: g=10m/s^2

u=20m/s

t=?

we know that time of ascent+time of descent= 2u/g

=2×20/10=4 seconds