Question

calculate the change in momentum of a body having mass 5 kg when its velocity decreases 20 metre per second to 10 metre per second​

Answer 1

QUESTION:

Calculate the change in momentum of a body having mass 5 kg when its velocity decreases 20 metre per second to 10 metre per second

ANSWER:

Change in momentum = -50 kgm/s

Explanation:

given that,

the mass of an object = 5 kg

given the initial velocity of the object = 10m/s

so,

initial momentum of the object =

mass of the object × initial velocity of the object

putting the values

5kg × 20 m/s

= 100 kgm/s

now,

given that,

now its velocity decreases to 10 m/s

so,

final velocity = 10 m/s

now,

final momentum =

mass of the object × final velocity of that object

putting the values

5 kg × 10 m/s

= 50 kgm/s

now,

change in momentum

= final momentum - initial momentum

putting the values

50 kgm/s - 100 kgm/s

= -50 kgm/s

so,

Change in momentum = -50 kgm/s

Answer 2

Aloha !

Answer: -50 Kg.m/s

Given :-

Mass (m) =5 kg

Initial velocity (i) = 20

Final velocity (v) = 10

Generally momentum is defined as product of mass and velocity

P = mv

Now Change in momentum :-

P = m (v) - m (i)

P =(5 × 10)- (5 × 20)

P = 50 - 100

P = -50 kg.m/s

One more thing to know -

Change in momentum is termed as impulse. Which is denoted with "j" . So here we have calculated IMPULSE.