Question

If a ball of mass 5kg is falling from a height of 10m what is the work done? Also, if the same ball is thrown perpendiculary upwards to a height of 10m what is the work done?​

Answer 1

Answer:

Given,

mass of the ball, m=5kg ;

height of the ball, h=10m

Initial potential energy of the ball,

E

p

=mgh=(5)(10)(10)=500J

When the ball reaches the ground, its potential energy becomes zero as it is entirely converted into its kinetic energy (E

k

), i.e.,

E

k

=500J

If v is the velocity attained by the ball just before reaching the ground,

E

k

=

2

1

mv

2

v=

m

2E

k

=

5

2×500

=14.14m/s

Answer 2

Answer:

490,980 joules

Explanation:

work = Force * displacement

here displacement = height

force = ma

=5*9.8

=49 N

Work done is 49*10=490 joules ( equation 1)

now when it is thrown upwards due to gravitation it falls down

hence work done is 2 times equation 1

so 2*490 = 980 joules

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