1). A motorist is traveling at 18.2 m/s when he sees a deer in the road 38.1 m ahead.
(a) If the maximum negative acceleration of the vehicle is -4.50 m/s2, what is the maximum reaction time t of the motorist that will allow him to avoid hitting the deer?
s
(b) If his reaction time is actually 0.300 s, how fast will he be traveling when he hits the deer?
m/s
2)An inquisitive physics student and mountain climber climbs a 50.0 m cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.00 m/s.
(a) How long after release of the first stone do the two stones hit the water?
s
(b) What was the initial velocity of the second stone?
m/s (downward)
(c) What is the velocity of each stone at the instant the two hit the water?
first stone
m/s (downward)
second stone
m/s (downward)
2007-09-03
16:10:27
·
1 answers
·
asked by
justin l
1
in
Science & Mathematics
➔ Physics