De Exercise 3
(Take g = 10 ms
1 A ball is projected horizontally from the top of a
hill with a velocity of 30 ms. If it reaches the
ground 5 seconds later, the height of the 11
IS:
A 200 m B. 125 m C 250 m
D 100 m E 65 m

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.)