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Lilit [14]
3 years ago
6

You are driving home from school steadily at 95 km/h for 180km. It then begins to rain and you slow to 65 km/h. You arrive home

after driving 4.5 h. (a) How far is your hometown from school? (b) What was your average speed?
Physics
1 answer:
tigry1 [53]3 years ago
3 0

Answer:

Explanation:

Given

Person travel 180 km with v_1=95\ km/h

and slow down to v_2=65\ km/h due to rain

time taken to cover 180 km is

t_1=\dfrac{180}{95}

t_1=1.89\ hr

total time T=4.5\ hr

suppose t_2 is the time for which it travels with v_2=65\ km/h

t_2=T-t_1

t_2=4.5-1.89

t_2=2.61\ hr

so distance travel during this time d_2=v_2\times t_2

d_2=65\times 2.61

d_2=169.65\ km

total distance d=180+d_2

d=180+169.65

d=349.65\ km

(b)Average speed

v_{avg}=\dfrac{Distance}{time}

v_{avg}=\dfrac{349.65}{4.5}

v_{avg}=77.7\ km/h

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