A 5.6 g experimental dart is fired into a block of wood with a mass of 24.6 g. The wood block is initially at rest on a 2.8 m tall post. After the collision, the wood block and dart land 2.9 m from the base of the post. Find the initial speed of the dart. Answer in units of m/s.

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I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.