Are the statements below true or false? For each you must explain your answer. 1. When an object is thrown upwards, its acceleration is zero at its highest point. 2.

If a falling object travels 20 m in T seconds, it travels 40 m in 2T seconds. Assume that the initial velocity is zero. 3. A negative velocity means the acceleration must also be negative at the same time. 4. Doubling the initial velocity of a ball thrown upwards doubles the maximum height it reaches.