Abullet of mass m is headed at horizontal speed v0 toward a block of mass 10m resting on a horizontal frictionless surface. the bullet strikes the block and comes to rest relative to the block somewhere deeply embedded inside the block. what average force did the block exert on the bullet if it took a time δt to stop the bullet?

Explanation:

The change in the momentum of an object is equal to the average force applied to that object in a given interval of time. We will apply this rule to the bigger mass, who is at rest initially.

can be found by the conservation of momentum:

Now the average force can be written in terms of v0, m, and Δt.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

a and b sometimes have a positive value