The train starts moving from a state of rest with acceleration a = 0.5 m / s2. Find ΔT if V = 72 km / h

univerkov | November 27, 2020 | education

Condition:
a = 0.5 m / s ^ 2
V = 72 km / h = 20 m / s
To find :
ΔT-? sec.
Decision :
V = V0 + at.
V = at (since V0 = 0).
ΔT = V / a
[ΔT] = m / s / m / s ^ 2 = c ^ 2 / c = c.
ΔT = 20 / 0.5 = 40 (sec.)
Answer: 40 sec.

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