Q1.A car of mass 400 kg moving at a speed of 20 m/s is brought to rest in 20 s by a constant retarding force. Calculate the retarding force.
Answers
Explanation:
✬ Retàrding Force = 400 N ✬
Explanation:
Given:
Mass of car is 400 kg.
Initial speed of car is 20 m/s.
Time taken to brought in rest is 20 s.
Final velocity is 0.
To Find:
Retarding force ?
Formula to be used:
Force = mass × acceleration
Acceleration = (v – u/t)
Solution: Here we have
u = 20 m/s
v = 0
t = 20 s
m = 400 kg
➟ So, acceleration = (v – u/t)
➟ a = (0 – 20/20)
➟ a = –20/20 = –1 m/a²
Substituting value on formula
⟹ F = m × a
⟹ F = 400 × –1
⟹ F = –400 N
(Negative sign shows that force is retarding)
Hence, retarding force will be 400 N.
S.I unit of force is Newton. It is denoted by capital N.
Answer:
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