A 2000-kg car traveling at 40m/s hits a wall with a force of 40,000N and comes to a stop what was the impact time? A-0.5s B-2s C-400s D-800s
2 answers
Question:
A 2000-kg car traveling at 40m/s hits a wall with a force of 40,000N and comes to a stop what was the impact time?
A-0.5s
B-2s
C-400s
D-800s
A-0.5s
B-2s
C-400s
D-800s
Answers
D- 800 s I think I did (40,000)(40)/2000 idk if this is the right answer
Answer:Option (B)Explanation:mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s, Force, F = 40,000 N, Final velocity, v = 0 m/sLet the impact time be t.By use of Newton's second lawF = m a where, a be the acceleration and m be the mass.40000 = 2000 x a a = 20 m/s^2Acceleration is negative because the car is stopped.Use first equation of motion, v = u + a x t 0 = 40 - 20 x tt = 2 second
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