Assume a maximum stopping acceleration of g/2 where g is acceleration due to gravity.
Answer:
2.99 m/s
Explanation:
Stopping distance, s = 3 ft = 0.914 m
final velocity, v = 0
a = g/2 = 4.9 m/s²
Use third equation of motion:
substitute the values to find the speed of train:
A fundamental force , is your answer .
So that we do not contaminate it with microorganisms or garbage or other human stuff.
Answer:
9. The Sun's Gravity
10. The core is the densest layer