Chapter 1, problem 7;
A pitcher has the ability to throw a baseball at 95mph.
a) How fast is the speed in ft/s?
b) How long does the hitter have to make a decision about swinging at the ball
if the plate and the mound are separated by 60 ft?
c) If the batter wanted a full second to make a decision, what would the speed
in mph have to be?
SOL:
a) Speed = 95 mph
1mi = 5280ft
95mi = 95 * 5280 ft
(95)(5280 ft )
Speed in ft/sec = (60)(60)
= 139.33 ft/s
b) d = 60 ft
d
Speed =
t
60 ft
139.33 ft/sec = time
60
Time = =0.431 s
139.33
c) Time = 1 sec
d isplacement
Speed = t ime
= 40.91mph
A pitcher has the ability to throw a baseball at 95mph.
a) How fast is the speed in ft/s?
b) How long does the hitter have to make a decision about swinging at the ball
if the plate and the mound are separated by 60 ft?
c) If the batter wanted a full second to make a decision, what would the speed
in mph have to be?
SOL:
a) Speed = 95 mph
1mi = 5280ft
95mi = 95 * 5280 ft
(95)(5280 ft )
Speed in ft/sec = (60)(60)
= 139.33 ft/s
b) d = 60 ft
d
Speed =
t
60 ft
139.33 ft/sec = time
60
Time = =0.431 s
139.33
c) Time = 1 sec
d isplacement
Speed = t ime
= 40.91mph
