Why the height of an object increases and then decreases as time passes ?

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A football is thrown forwards out of a car window at a speed of 10 m/s with respect to the car, the car is travelling at a speed of 30 m/s with respect to the road. What is the total speed of the ball with respect to the road?     10 m/s (just the speed of the throw)     30 m/s (just the speed of the car)     there's no way of knowing     40 m/s (Sum of the speed of the throw and the speed of the car)

QUESTION 3 - The following equation refers to v-pendulum experiment: T4 = (44 L ki g²)(8 m4L/g² )d, where : L: length of the string (2 meters). T: pendulum periodic time d: distance between rods k: pendulum constant g: gravitational acceleration Given that the slope of the graph (T4,d) = -14.2 s4/m, and y-intercept = 13.5 s4, Find the value for g: 9.81 m/s2 O Can't be defined a- 8.51 m/s2 a 10.5 m/s²