Speed And Velocity

A block of mass of 1 kg is moving on the x axis. A force F acting on the block is shown. Velocity of the block at time is - What is the speed of the block at time t = 4s ?

A train travels east towards Hubli at A man on the train runs from the front of the train toward the rear of the train at with respect to train. As he runs, he carries a plate of fruit with him. He notices a giant spider on the plate and throws the plate away from him (toward the rear of the train) at with respect to him. Just after that instant, the startled spider jumps towards the man at with respect to plate. The instant after the spider jumps toward the man, how fast is the spider approaching Hubli?