Which group of quantities below consists only of scalar quantities? which group of quantities below consists only of scalar quantities? average speed, displacement, time interval?

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface