Question

8. How far will a brick starting from rest fall freely in 3.0 seconds?

Answer 1

Answer:

When object falls freely we can say

When object falls freely we can sayits initial speed will be ZERO

When object falls freely we can sayits initial speed will be ZEROand its acceleration due to gravity must be

When object falls freely we can sayits initial speed will be ZEROand its acceleration due to gravity must beNow we need to find the distance of free fall in 3 s of time

When object falls freely we can sayits initial speed will be ZEROand its acceleration due to gravity must beNow we need to find the distance of free fall in 3 s of timeSo here we will use kinematics

When object falls freely we can sayits initial speed will be ZEROand its acceleration due to gravity must beNow we need to find the distance of free fall in 3 s of timeSo here we will use kinematicsnow we will plug in all values in it

When object falls freely we can sayits initial speed will be ZEROand its acceleration due to gravity must beNow we need to find the distance of free fall in 3 s of timeSo here we will use kinematicsnow we will plug in all values in itSo it will fall by total distance of 44.1

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Answer 2

It depends on the acceleration due to gravity, which is pulling you. Now here I am giving the analysis on three different surfaces viz. Earth, moon and mars. These have different gravitational accelerations.

Assuming, no air drag or friction and gravity is constant.

1] On Earth, the gravity g = 9.8 m/s2

Applying Newton's 2nd equation,

S = ut + 1/2 at^2

Here a = g and u = 0 ( falling) and t = 3 sec

S = 1/2 gt^2

S = 44.1m

2] On Moon, gravity = g/6 = 1.635 m/s2

Here a = g/6 and u = 0 ( falling) and t = 3 sec

s = 1/2 gt^2

S = 7.3575m

3] On Mars, gravity = 0.38g = 3.7278 m/s2

Applying Newton's 2nd equation,

Here a = 0.38g = 3.72 m/s2 and u = 0 ( falling) and t = 3 sec

S = 1/2(3.72)(3)^2

S =16.775m

Henve from above we can see the height coverd in 3 sec at earth, moon and mars. Earth has highest gravity among these so the height covered at earth is higer than other two.

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