1)
Given: d = 500m
t = 180s
convert minutes to seconds
t = 3min × 60s / 1min = 180s
Unknown: s = ?
Formula: s = d/t
where in, s = speed
d = distance
t = time
Solution: s = d / t
= 500m / 180s
= 2.78m/s
Final Answer: s = 2.78m/s
2)
Given: d = 600km S
t = 24h
Note: S means South (600km going South)
Unknown: v = ?
Formula: V = ∆d / ∆t
where in, v = velocity
∆d = displacement
∆t = time
Solution: V = ∆d / ∆t
= 600km S / 24h
= 25km/h S
Final Answer: V = 25km/h S
3)
Given: Vi = 0km/h
Vf = 30km/h
t = 0.5h
convert minute to hour:
half an hour = 30min
30min × 1h / 60min = 0.5h
Note: The problem said that the car starts from test that's why the initial velocity is automatically zero (0)
Unknown: a = ?
Formula: a = Vf - Vi / t
where in, a = acceleration
Vf = final velocity
Vi = initial velocity
Solution: a = Vf - Vi / t
= 30km/h - 0km/h / 0.5h
= 30km/h / 0.5h
= 60km/h²
Final Answer: a = 60km/h²
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Answers & Comments
1)
Given: d = 500m
t = 180s
convert minutes to seconds
t = 3min × 60s / 1min = 180s
Unknown: s = ?
Formula: s = d/t
where in, s = speed
d = distance
t = time
Solution: s = d / t
= 500m / 180s
= 2.78m/s
Final Answer: s = 2.78m/s
2)
Given: d = 600km S
t = 24h
Note: S means South (600km going South)
Unknown: v = ?
Formula: V = ∆d / ∆t
where in, v = velocity
∆d = displacement
∆t = time
Solution: V = ∆d / ∆t
= 600km S / 24h
= 25km/h S
Final Answer: V = 25km/h S
3)
Given: Vi = 0km/h
Vf = 30km/h
t = 0.5h
convert minute to hour:
half an hour = 30min
30min × 1h / 60min = 0.5h
Note: The problem said that the car starts from test that's why the initial velocity is automatically zero (0)
Unknown: a = ?
Formula: a = Vf - Vi / t
where in, a = acceleration
Vf = final velocity
Vi = initial velocity
t = time
Solution: a = Vf - Vi / t
= 30km/h - 0km/h / 0.5h
= 30km/h / 0.5h
= 60km/h²
Final Answer: a = 60km/h²