78 km/h
= 780000/3600 m/s
= 21.667 m/s
From initial speed u=0, with acceleration a=50 m/s/s, final speed v=21.667 is attained in t seconds, where
v=ut+(1/2)at²
Can you find t?
Note: it will be less than a second!
The head of a rattlesnake can accelerate 50 m/s2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 78 km/h from rest?
1 answer
1 answer