Question

Brainly.in What is your question? qureshigaming8 avatar qureshigaming8 20 hours ago Physics Secondary School +5 pts Aisha dropped an object of mass 4 Kg from a height of 10m. The object has a speed of 0 m/s at position A and is at a height A of 10m above the ground. At position B, the object is 6m above B the ground. At position C, the object is 4m above the ground. At point D, the object is mere picometer ( almost at 0 meter height) С above the ground. Assume negligible air resistance throughout the motion. Use this information to fill in the table. (g=10m/s2)​

Answer 1

Answer:

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Explanation:

Given :  The object has a speed of 0 m/s at position A and is at a height

A  of 10m above the ground.

To find : Velocity & time taken to reach at B , C & D

Solution:

At  t = 0    position  A  - 10 m above ground    velocity =  0  

PE = mgh = 4 * 10 * 10 = 400 Joule

KE =(1/2)mv² = 0

At position B  - 6 m above ground distance covered  (10 - 6) = 4 m

S = ut + (1/2)at²  

u = 0

a = g = 10

=> 4 = (1/2)(10)t²

=> t = √0.8  =  0.9 sec

V = U  + at   =  9 m/s

PE = 4 * 10 * 6 ≈ 240 joule

KE = 400 - 240 ≈ 160 Joule

At position C  - 4 m above ground distance covered  (10 - 4) =6 m

S = ut + (1/2)at²  

u = 0

a = g = 10

=> 6 = (1/2)(10)t²

=> t = √1.2  ≈ 1.1 sec

V = U  + at   ≈  11 m/s  

PE = 4 * 10 * 4 = 160 joule

KE = 400 - 160 = 240 Joule

At position D  - 0 m above ground distance covered  (10 - 0) =10 m

S = ut + (1/2)at²  

u = 0

a = g = 10

=> 10 = (1/2)(10)t²

=> t = √2  = 1.4sec

V = U  + at   =  14 m/s  

PE = 4 * 10 * 0 =  0 joule

KE = 400  Joule

Position  Distance from ground  PE    KE     Time         Velocity      

A                   10 m                       400  0        0  s             0 m/s

B                   6 m                         240  160     0.9 s           9 m/s

C                  4 m                          160   240     1.1 s            11 m/s

D                    0 m                        0      400      1.4 s           14 m/s

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