JpGabidn
Answered

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Directions: Solve the following problems

1. An object with mass of 25kg has its velocity change from 15m/s to 8m/s east. Find the object change in momentum.

2. How much force is needed to stop an object with 35kg moving horizontally with a velocity of 9m/s for 15 seconds?

ANSWER PLEASE ​

Sagot :

Answer:

1. 175 kgm/s to the west.

2. -21 N (21 N of force in the opposite direction)

Explanation:

1. change in momentum = mass * change in velocity

change in velocity = final velocity - initial velocity

therefore, change in velocity = 8 - 15 = -7 m/s

and the change in momentum = 25 * -7 = -175 kgm/s

In the question, east in defined as the positive direction, therefore the minus sign (-) corresponds to the change in momentum being to the west.

2. The impulse equation is:

Force * change in time = mass * change in velocity

Rearrange this to make Force the subject:

Force = (mass * change in velocity) / (change in time)

Force = (35 * (0 - 9)) / 15 = -21 N

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