Question

d. An object thrown vertically upwards
reaches a height of 500 m. What was
its initial velocity? How long will the
object take to come back to the
earth? Assume g = 10 m/s2
Ans: 100 m/s and 20 s​

Answer 1

Explanation:

Let the initial velocity = u

final velocity = v

v= 0 m/s

s = 500 m

2gs = v

2

−u

2

2 (-10) 500 = u

2

u = 100 m/s

v = u + at

0 = 100 - 10 t

t = 10 s

total time taken = 20 sec.

Answer 2

Answer:

Answer: The initial velocity is 100 m/s and the total time taken to reach the ground is 20 s.