Which requires that the brakes of a car do the most amount of work?
1. none of these
2. not enough information is given
3. both require the same work
4. slowing down from 100 km/h to 50 km/h
5. slowing down from 50 km/h to rest

The specific heat of silver is 0.057 calories/gram°c. if 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°c, how many calories of heat energy were absorbed by the sample?

Which component of the earth’s atmosphere is decreased due to photosynthesis?

A6.0-kilogram cart initially traveling at 4.0 meters per second east accelerates uniformly at 0.50 meter per second squared east for 3.0 seconds. what is the speed of the cart at the end of this 3.0 second interval? (1) 1.5 m/s (3) 3.0 m/s (2) 5.5 m/s (4) 7.0 m/s