Achild is sliding on a sled at 1.5 m/s to the right. you stop the sled by pushing on it for 0.60 s in a direction opposite to its motion. if the mass of the child and sled is 41 kg, what is the magnitude of the average force you need to apply to stop the sled? use the concepts of impulse and momentum. express your answer with the appropriate units.

102.5 N

Explanation:

The impulse theorem applied to this situation states that:

where

F is the average force applied on the child and the sled

is the time interval during which the force is applied

The term on the right represents the variation of momentum, which is the product of:

m is the mass of the child+sled

is the change in velocity of the child+sled

In this situation we have:

m = 41 kg

So we can solve to find the average force:

And the negative sign means the force is applied against the direction of motion of the child. So the magnitude of the force is 102.5 N.

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is