Bob has just finished climbing a sheer cliff above a beach, and wants to figure
ID: 1654137 • Letter: B
Question
Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can throw the ball is 76.0 mph. Bob starts the stopwatch as he throws the ball (with no way to measure the ball's initial trajectory), and watches carefully. The ball rises and then falls, and after 0.510 seconds the ball is once again level with Bob. Bob can't see well enough to time when the ball hits the ground. Bob's friend then measures that the ball landed 431 ft from the base of the cliff. How high up is Bob, if the ball started from exactly 5 ft above the edge of the cliff?
Explanation / Answer
Given,
v = 76 mph = 111.47 ft/s ; t = 0.51 s ; Dx = 431 ft ; h = 5 ft
t = 2 v sin(theta)/g
theta = sin^-1(t g/2v) = sin^-1(0.51 x 32/2 x 111.47) = 4.2 deg
vy = v sin(theta) = 111.47 x sin4.2 = 8.16 ft/s
vx = v cos(theta) = 111.47 x cos4.2 = 111.17 ft/s
we got range as, Dx = 431 ft
Dx = vx t => t = Dx/vx = 431 ft/111.17 = 3.88 s
time spent below the cliff is:
t = 3.88 - 0.51 = 3.37 s
from eqn of motion
S = ut + 1/2 at^2
S = - 8.16 x 3.37 - 0.5 x 32 x 3.37^2 = -209.21 ft
Hence, height = S = 209.21 ft