If an object is projected upward with an initial velocity of 127 ft per? sec, its height h after t seconds is h equals negative 16 t squared plus 127 th=? 16t2+127t. find the height of the object after 55 seconds.

If two metal balls each have a charge of -10^-6 c and the repulsive force between them is 1 n, how far apart are they? (coulomb's constant is k = 9.0x 10^9 n-m^2/c^2? 9.5 m 9.0 mm 9.5 cm 0.9 m .

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.