Question

1. If a wooden, plastic and a metal ball of same size are dropped at the same time from the same height in a perfect vacuum, which one will hit the ground first?
a. Metal first, then plastic, then wood
b. Wood first, then plastic, then metal
c. They will all hit the ground at the same time
d. There is no way to tell

Answer 1

Answer:

c. They will all hit the ground at the same time

Explanation:

beacause in common atmosphere there is gravitational pressure but in vaccum it is empty ie.. there no air molecules so all masses drop at the same time

Answer 2

Given:

A wooden, plastic and a metal ball of same size are dropped at the same time from the same height in a perfect vacuum.

To find:

Which ball would hit the floor first?

Solution:

• First of all, we know that acceleration due to gravity acting on an object does not depend on the mass of that object.

• g = GM/r² = 9.8 m/s². Here M is mass of earth and r is radius of earth.

• Also, since the balls are dropped in perfect vacuum, we should neglect the possibility of any air resistance.

• As a result of same acceleration and no air resistance, all the three balls would reach the floor at the same time.

$\star$ Option c) ✔️