Which of these is not an example of acceleration?
a.) moving at 20 m/s in a circle
b.) speeding up from 5 m/s to 10 m/s
c.) slowing down from 10 km/h to 5 km/h
d.) moving at a constant speed of 150 km/h

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?