Question

18. An object dropped from a certain height reaches the ground in 1 second
takes
Assuming there is no gravity, with what velocity (m/s) must the object be
the same time to reach the ground?
(Acceleration due to gravity=10 m/s2)
(a) 5
(c)3
(b) 4.9
(d) 2​

Answer 1

Answer:

The answer is 5 m/s.

Explanation:

Let h be the height of the object.

According to Newton's 2nd law of motion,

s = ut + 1/2 at^2

h = 0×1 + 1/2 × 10 × 1^2

h = 5 m

When there's no gravity, the velocity of throwing object need to be -

v = h / t

v = 5 / 1

v = 5 m/s

Thus the velocity of the object is 5 m/s.