Question

How much work is needed to be done on a ball of mass 50 gm to give it a momentum of 5 kgm/s

Answer 1

Answer:

Mass of the ball, m = 50 g = 0.05 kg

Initial velocity, u = 0

Final momentum = 5 kg m/s

Final velocity,

v

=

F

i

n

a

l

m

o

m

e

n

t

u

m

M

a

s

s

=

5

0.05

=

100

m

/

s

So, work done = Change in KE of the ball

=

1

2

m

v

2

=

1

2

×

0.05

×

100

2

=

250

J