Convex lenses are thicker at the centers than the edges, they are known as the converging lenses. Rays of light that pass through the lens are brought closer together (they converge). When rays of light that are parallel pass through a convex lens they are refracted, the refracted rays converge at one point called the principal focus.
Acceleration because it is at a rise in speed. The formula for acceleration is Speed/Time.
Magnitude of displacement = 
Adding the squares gives displacement = 
Displacement = ≈ 724.7m
I believe the answer is 3). The cell wall provides protection, it doesn’t control movements of materials in and out of the cell.
Speed is defined as the distance over time. So in measuring the speed of a car, the most manual thing that we can do besides using a speedometer is to measure a certain distance then measure the time at which the car passes that distance then divide the distance over the time. Then determine the speed limit.
