4.
A body increases its speed from 30 km/h to 50 km/h in 20 sec. And then decreases its speed from 50 km/h to
40 km/h in next 20 sec, average acceleration of the car is-
A) 15 m/s2
B) 0.5 m/s2
C) 1500 km/h?
D) 900 km/h
Answers
Answered by
1
Answer:
acceleration is change in velocity per unit time
a = (v2-v1)/(t2-t1)
v2-v1 = 30 kmph
= 30×5/18 m/s
= 25/3 m/s
t2-t1 = 10s
a= 25/(3×10) = 5/6 m/s^2
Step-by-step explanation:
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