The boy is moving at a speed of 1.5 m / s. Calculate the speed of the car moving towards the boy at a speed of 72 km / h.
| March 2, 2021 | education
Vm = 1.5 m / s.
Vа = 72 km / h = 20 m / s.
Vа / m -?
According to the law of relativity of velocities, the speed of a body relative to the moving coordinate system Vtp is the vector sum of the body’s velocity relative to the stationary coordinate system Vtn and the speed of the moving coordinate system relative to the stationary system Vpn: Vtp = Vtn + Vpn.
By the condition of the problem, Vtp = Va / m, Vtn = Vm, Vpn = Va.
Va / m = Vm + Vpa.
Vа / m = 1.5 m / s + 20 m / s = 21.5 m / s.
Answer: the car is moving relative to the boy at a speed Vm / a = 21.5 m / s.
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