A car weighing 500 kg, accelerating from a standstill with uniform acceleration, reached a speed of 20 m / s in 10 s.
| July 10, 2021 | education
A car weighing 500 kg, accelerating from a standstill with uniform acceleration, reached a speed of 20 m / s in 10 s. The resultant of all forces acting on the car.
m = 500 kg.
V0 = 0 m / s.
V = 20 m / s.
t = 10 s.
F -?
According to Newton’s 2 law, the resultant of all the forces F that act on the body is equal to the product of the body’s mass m by its acceleration a: F = m * a.
We express the acceleration of the car a according to the definition by the formula: a = (V – V0) / t.
The resultant of all forces F will be determined by the formula: F = m * (V – V0) / t.
F = 500 kg * (20 m / s – 0 m / s) / 10 s = 1000 N.
Answer: the resultant of all the forces that act on the car is F = 1000 N.
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