When the sum of all the forces acting on a block on an inclined plane is zero, the block A) must be at rest
B) must be accelerating
C) may be slowing down
D) may be moving at constant speed

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.