Answer: yes u can use a 6.75 when measuring the pencil
I believe the answer is resonance
Answer:
Velocity on the right side of the cart 
Explanation:
Given
⇒The mass on the left of the cart 
Its velocity
,
⇒Mass on the right of the cart 
Velocity
We have to find 
From
The law of conservation of linear momentum:
We can say that.
Initial momentum will equalize the final momentum.
And momentum is the product of mass and its velocity.
Assigning one of its velocity as negative because both are in different direction.
Lets call 
Recalling the formula and plugging the values.


So the velocity of the cart on the right side that has a mass of
is 
The initial speed doesn’t matter. To reach the maximum height, you need to launch straight up ... 90 degrees above horizontal.