i'll save myself by pushing on the dash
stopping these objects at the speeds shown
is similar to catching a 100 # wt dropped from -
| speed |
75#
child |
175#
adult |
20#
dog |
4#
book |
| 10 mph
| 2ft | 10ft |
2 in | 1/2 in |
|
| 20 mph
| 8ft
| 41ft |
6" | ~1" |
| 30 mph
| 17ft | 93ft |
14" | ~3" |
| 40 mph
| 30ft | 165ft |
26" | ~5" |
| 50 mph
| 47ft | 259ft |
40" | ~8" |
| 60 mph
| 68ft | 372ft |
58" | ~1ft |
| speed |
75#
child |
175#
adult |
20#
dog |
4#
book |
think of the "push" you exerted against the bathroom scale --
maybe 100 #
at 10 mph (which is 15 feet / second)--
- a 75 # child has about 1,100 ft # / sec of momentum -- (multiply 75 # x 15 ft/sec)
- an 175 # adult has about 2,600 ft # / sec of momentum
- the 20 # dog has 300 ft # / sec of momentum
- the 4 # book has 60 ft # / sec of momentum
most people can save themselves
in a crash of no more than 2 mph !
if you could push hard enough to "save yourself" --
your bones would explode
9/10s/95 --- 4/19f/96