if a force of -156.59 N is applied over 58.16 m to bring a 258.88 kg object to a stop, how fast was it initially traveling?

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )