Detailed explanation please

I. Practice Questions Use g = 10ms - in this exercise. 1. A car is travelling along a straight road. It accelerates uniformly from rest to a speed of 15ms" and maintains this speed for 10 minutes. It then decelerates uniformly to rest. If the acceleration and deceleration are 5ms 2 and 8ms 2 respectively, find the total journey time and the total distance travelled during the journey. 2. A skier pushes off at the top of a slope with an initial speed of 2ms 1. She gains speed at a constant rate throughout her run. After 10 s she is moving at 6ms (i) Find an expression for her speed t seconds after she pushes off. (ii) Find an expression for the distance she has travelled at time t seconds. (1) The length of the ski slope is 400m. What is her speed at the bottom of the slope? 3. Towards the end of a half-marathon Sabina is 100m from the finish line and is running at a constant speed of 5ms . Daniel, who is 140m from the finish and is running at 4ms , decides to accelerate to try to beat Sabina. If he accelerates uniformly at 0.25ms - does he succeed