Question

a loaded lorry of 12000kg and moving with a velocity of 10 m/s comes to rest after 5s applying the breaks what is the change in momentum,what is the rate of change of momentum​

Answer 1

Answer:

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

Explanation:

Answer 2

Given:-

• Mass = m = 12,000 kg
• Initial velocity = u = 10 m/s
• Time taken = t = 5 s

To find:-

• Change in momentum
• Rate of change of momentum

Answer:-

As the body comes to rest, final velocity= v = 0 m/s.

Finding change in momentum:

We know that, momentum = mass * velocity

→ p = mv

And, change in momentum = (final momentum) - (initial momentum)

→ ∆p = mv - mu

→ ∆p = m(v - u)

where,

• m is mass
• u is initial velocity
• v is Final velocity

Putting values given in the question,

→ ∆p = 12000 (0 - 10)

→ ∆p = 12000 * (-10)

→ ∆p = -120000 N s or kg m/s Ans

Finding rate of change of momentum:-

Rate of change of momentum = (change in momentum) / (time taken)

= ∆p/t

where,

• ∆p is change in momentum
• t is time taken

Putting the values given in the question,

→ Rate of change of momentum = (-120000)/5

→ Rate of change of momentum = -24,000 N Ans