The highest barrier that a projectile can clear is 19.7 m, when the projectile is launched at an angle of 15.0o above the horizontal. what is the projectile’s launch speed?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?