Physics, asked by faisalpaul59, 8 months ago

aisha dropped an object of mass 4kg from a height of 10m.the object has a speed of 0m/s at position A and is at a height of 10m above the ground .At position B ,the object is 6m above the ground .At position C the object 4m above the ground .At point D,the object is mere picimeter (almost at 0 meter height)above the ground .Assume negligible air resistance throughout the motion.use this information to fill in the blanks (g=10/s)
position height(m) potential velocity v ep+ek 10
a 6
4
0

b
c
d energy(ep) ​

Answers

Answered by premshreegupta44
5

Answer:

10 m

Explanation:

object is just droped,that is with intial velocity =0

And after that it will gain velocity going down due to acceleration due to gravity...!

Answered by amitnrw
21

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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