Do I need to use trig and is the 10 centimeters an angle

[Ilovmyjeep]

A bullet is fired through a board 10 cm thick in such a way that the bullets line of motion is perpendicular to the face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side with a speed of 300 m/s. what is the accelaeration of the bullet as it passes through the board and the total time it takes to pass through the board? ]

]

 

[Atomos]

No, you do not, and no. 10 centimeters are 10 hundredths of a meter which is the primary metric unit of length.

 

[Astronuc]

A bullet is fired through a board 10 cm thick in such a way that the bullets line of motion is perpendicular to the face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side with a speed of 300 m/s. what is the accelaeration of the bullet as it passes through the board and the total time it takes to pass through the board?

As Atomos indicated, make sure units have the same basis MKS or cgs. One has distance, and velocity before and after that distance. There is a particular equation concerning that relationship.