Bo and Luke are running from Roscoe P. Coltrane and are going to jump the Genera
ID: 1277962 • Letter: B
Question
Bo and Luke are running from Roscoe P. Coltrane and are going to jump the General Lee (their car) over the Hazard River. The river is 23 m across, and there is a 1.5 m high pile of dirt at the edge of the river that makes an angle of 33 degrees above the horizontal. They will use the pile of dirt as a launch ramp to get across the river.
a) What is the slowest that Luke can drive the car so that it will make the jump over the river?
b) How high does the General Lee get at this speed?
c) How much time do Bo and Luke spend in the air?
Explanation / Answer
a)speed be U
t = 23/Ucos33
1.5 = - usin33 *t + 4.9*t*t
U = 14.97 m/s
b)
max heigh t = 1.5 + (3.391 = 4.89 m
c)
T = time of flight = 2*14.97*sin33/9.8= 1.66 sec