Question

100, UE del, make sure you study Chapters 2 and 3, plus class lecture notes. Study more relevant example problems. Last Name: First Name 1. A man stands at the edge of a cliff and throws a rock downward with a speed of 12.0 ms. Sometime later it strikes the ground 110 m below the place where it was thrown. (a) How long does it take to reach the ground? (b) What is the speed of the rock at impact? Just provide the answer below. Answer:__(a) (b) 2. Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart as initial speed of 30.0 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and falling back down, eventually hitting the ground beneath the cliff. Gun B is fired straight downward. In the absence of air resistance, how long after pellet B hits the ground does pellet A hit the ground? Provide your answers below: You must provide a diagram

Answer 1

ans 1.a. initial velocity u = 12 m/s

height h = 110 m

gravitational acceleration g = 9.8 m/s²

relevant equation is h = u*t+1/2*g*t²

110 = 12*t+4.9 *t²

4.9*t² +12*t -110 = 0

solving this we get t= 3.67 second

b. relevant equation is v = u+g*t

v = 12+ 9.8*3.67 = 47.97 m/s