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gracie0818
22.08.2019 •
Mathematics
Abus slams on its breaks and goes from 30 km/hr to 15km/hr in 4 seconds. what is its acceleration?
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Ответ:
Acceleration is the rate of change of speed.
If the speed is increased then its called acceleration
If the speed is decresed then its a negative acceleration also called deceleration
the formula for calculating acceleration is
where a - acceleration
v - final velocity
u - initial velocity
t - time
v - 15 km/hr should be converted to m/s
distance in 1 hour - 15 km
1 hour = 3600 s
1 km - 1000 m
in 3600 s - 15 000 m
in 1 s - 15 000 m / 3600 s = 4.17 m/s
u - 30 km/hr
in 3600 s - 30 000 m
in 1 s - 30 000 m / 3600 s = 8.33 m/s
substituting the values in the equation
the answer is negative means its deceleration
the acceleration is -1.04 m/s²
Ответ:
-9 and 3 are x
4 and -12 are y
x are 12 points away
y is 16 points away
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