Ht. = 50 m.?
a. V^2 = Vo^2 + 2g*h
V^2 = 0 + 19.6*50 = 980
V = 31.3 m/s.
b. V = Vo + g*t = 31.3 m/s.
0 + 9.8t = 31.3
t = 3.19 s.
c. m = 2.0Lb * 0.454kg/Lb = 0.908 kg.
KE = m*V^2/2 = 0.908*31.3^2/2 = 444.8 J.
a 2.00 lb rock is dropped from a bridge to the water 50 below.
a. what is the velocity as it hits the water?
b. how long does it take to hit the water?
c. What is its kinetic energy as it hits the H2o?
1 answer
1 answer