Solving Momentum Questions: Find Speed of Toy Car After Pellet Impact

[Fresko]

Homework Statement

A pellet is fired from a gun. the Pellet is fired horizontally into the a toy car, which has modelling clay attached to it. The pellet remains in the clay as the car moves.

The car travels a distance of 0.069M before coming to a rest at 1.3s

show that the speed of the car immediately after being struck by the pellet was about 1 m/s

Homework Equations

No idea, but it also asks in part 2, the assumption you made in order to apply the equation.

The Attempt at a Solution

my attempt was using the kinematic equations but I reached a value of 0.1 m/s which is no where near 1m/s

 

[PhanthomJay]

using the kinematic equations is the correct approach. I also get your answer. Could be a typo in the book answer.

 

[Fresko]

using the kinematic equations is the correct approach. I also get your answer. Could be a typo in the book answer.

It cannot be, the value is way off.

 

[Fresko]

using the kinematic equations is the correct approach. I also get your answer. Could be a typo in the book answer.

Never mind, you are indeed correct and I apologise, I just realized I read the value for distance differently, the kinematic equations gave a value of 1.06m/s which is good enough for me.

However now I have to state an assumption in order to apply the equation I used.

 

[PhanthomJay]

The usual assumptions about under what conditions momentum is considered, you might think of others.