Please help! Giving 20 points!! If two train cars, one of mass 1000 kg and the other of 1750 kg, are next to each other and connected by a compressed spring, and the spring releases so that the heavier car moves off at 4 m/s, what is the velocity of the other car?

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.)