Question

- How much momentum will a stone of mass
4.5 kg transfers, if it falls from a height of
1.25 m? Take its downward acceleration as
10 ms-2​

Answer 1

Answer:

22.5

Explanation:

given=mass=4.5kg,height=1.25m,acceleration=10m/s2

velocity =?

momentum = m×v

we don't know velocity therefore

according to third equation of motion

v2=u2+2as

v2=0+2×10×1.25

v2=25

v=5

then momentum =4.5×5

= 22.5kgm/s

Answer 2

Answer:

2.25

Explanation:

momentum=mass×velocity

initial velocity, u=0

height,h=1.25m

mass=4.5kg

given, acceleration g=10m/s2

h=ut+1/2at2

1.25=0+1/2×(10)×t2

t2=1.25/5

t=0.05

v=u+at

v=10×0.05

v=0.5

momentum=4.5×0.5

momentum = 2.25