If two charged balloons are 10cm apart and they feel a force of electrical repulsion of 20N, what would the force of electrical repulsion become if the balloons were moved apart to a distance of 100cm?

Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j

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.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?