if a skateboarder lands on the ground after 3 seconds with a final velocity of -4.5 m/s, what is the skateboarder's horizontal displacement? * the answer is -13.5m (how please show steps pleaseeeee)

The reason why I did ask is because it hard and I need help

SOLVE CAREFULLY!! Please Write Clearly and Box the final Answer for Part A, with THE CORRECT UNITS ( should be rad/sec^2) Thank you. Express your answer to three significant figures and include appropriate units. DRAW the kinematic diagram and label it

QUESTION 11 An air missile falls vertically into the ocean and enters the sea water with velocity 148 m s¯1. Its deceleration a (m-s-2) wthin the water is a function of its velocity v (m-s-1) according to the expression a=-5v Determine the sea depth at which the velocity of the missile becomes zero by assuming straight vertical motion. Provide only the numerical value (in metres) to zero decimal places and do not include the units in the answer box.