You throw a ball vertically upwards and watch its motion. Which of the following statements are true? Assume the "clock" starts ticking the instant the ball leaves your hand... (you can pick more than one!)A. Ball has same velocity when leaving and returning to your handB .Both the acceleration and velocity change signC. The velocitychanges sign, the acceleration does notD. At the top-most point, there is no acceleration on the body

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)