Physics Force Velocity Energy stuff?? waiting for help pleassee?

Question

Please help me for my test tomm. Ill be waiting for replys

A miniture 8Newton truck travels at 3.2 m/s on a horzantol beneath a loading tube. When directly under the tube a 1.60 k/g of weight falls instantaneously in the truck. what is the velocity AFTER the car is loaded with the weight...

so the final velocity is definetly under 3.2 m/s.

Anyoneeee?????? please show me the steps and equations thanksss

mometum=mass times velocity

Answer 1

You have to calculate p=massXspeed before the "collision". The quantity remains constant, so if the mass increases, the speed must decreases by the same ratio for the p to stay the same. (First, you have to convert the 8N weight to a mass using the 9,8N/kg gravity constant)

Answer 2

This is a momentum question.

Momentum = mass X speed

Momentum (Mo) is conserved so the Mo of the truck empty has to equal the Mo of the truck after the weight falls into it.

The Mo of the truck empty is 8N. Using the equation for momentum we can calculate the truck's empty mass:

Mo = mass X speed, so 8 = mass X 3.2

Therefore, mass = 8/3.2 = 2.5 kg

The final mass of the truck and the weight equals 2.5kg + 1.60kg = 4.1kg

Remembering that momentum is unchanged, we can calculate the final speed of the truck using our momentum equation:

Momentum = mass X speed

Therefore,

8N = (4.1)(speed)

Therefore, speed = 8/4.1 = 1.95 m/s

Answer 3

listen to the angel guy, what he says is correct

in the horizontal direction The initial momentum is equal to the final momentum

the 8N is the Force of the car due to gravity, which is also equal to mg, mass itmes the gravitational constant, 9.8.

mv = m'v' so v', the second velocity is = mv/m'

m' is the second weight, or m + the 1.6 kg weight

Answer 4

you have to use momentum, they give you weight so that you can find the mass(just divide the 8 newtons by 9.8), then multiply it by the initial velocity, then final momentum has to equal the initial momentum so the initial momentum is equal to the mass of the truck plus the mass of the thing that fell on it times a velocity.

Answer 5

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