A car moving with an initial velocity of 25 m/s north has a constant acceleration of 3 m/s south. After 6 seconds its velocity will be:
A) 7 m/s north B) 7 m/s south C) 43 m/s north D) 20 m/s north
Answer: __________
A) 7 m/s north B) 7 m/s south C) 43 m/s north D) 20 m/s north
Answer: __________
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Answer:
A
Explanation:
north = positive (+)
south = negative (-)
acceleration = -3
time = 6 s
initial velocity = 25 m/s
final velocity = ?
final velocity = initial velocity + (acceleration × time)
= 25 m/s + (-3
× 6 s)
= 25 + (-18)
final velocity = 7 m/s
Since the final velocity is positive, the direction is north.
The answer is 7 m/s north.