Question
Calculate the force required to accelerate a car from rest to a velocity of 30 ms−1 in 10 seconds. The mass of the car is 1500 kg.
Answer: Option C
:
C
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C
Here, mass m = 1500 kg
Initial velocity, u = 0, final velocity, v = 30 ms−1, time taken, t = 10 s.
Now, putting these values in the first equation of motion,v=u+at, we get
30=0+a×t,
⇒ 10a=30
⇒ a=3 ms−2
Now, putting m= 1500 kg and a = 3 ms−2 in equation, F=m×a, we get
F=1500×3 = 4500 N.
Thus, the force required is 4500 N.
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