A car moving at a speed of 20 m / s starts to brake and stops after 5 s. What is the mass of a car
| November 18, 2020 | education
A car moving at a speed of 20 m / s starts to brake and stops after 5 s. What is the mass of a car if the total resistance to movement is 4000 N?
Given:
V (speed) = 20m / s
t = 5 s
F (drag force) = 4000 N
Find: m (mass)
Decision:
By condition, we can find the acceleration, then we can calculate the mass
a (acceleration) = V / t = 20: 5 = 4 m / s ^ 2
According to Newton’s second law: F = ma we calculate the mass
m = F / a = 4000: 4 = 1000 kg
Answer: 1000 kg
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