A meatball, originally at rest, free-falls. What is the speed of the meatball af

Question

A meatball, originally at rest, free-falls. What is the speed of the meatball after (round to nearest integer; use g = 10 m/s2)

1 second?

2 seconds?

3 seconds?

4 seconds?

5 seconds?

10 seconds?

By how much does the speed of the meatball change in each second?

After how many seconds will the meatball reach the speed of 80 m/s?

After how many seconds will the meatball become supersonic i.e. exceed the speed of 344 m/s? (round to the nearest second)

A meatball, originally at rest, free-falls. What is the speed of the meatball after (round to nearest integer, use g 10 m/s2 1 second? 2 seconds? 5 seconds 4 seconds? 5 seconds? 10 seconds? By how much does the speed of the meatball change in each second? After how many seconds will the meatball reach the speed of 80 m/s? After how many seconds will the meatball become supersonic i.e. exceed the speed of 344 m/s? (round to the nearest second)

Explanation / Answer

after 1 second

v = u + gt = 0 + 10*1 = 10 m/s

2 seconds

v = 0 + 10*2 = 20 m/s

3 seconds

v = 0 + 10*3 = 30 m/s

4 seconds

v = 0 + 10*4 = 40 m/s

5 seconds

v = 0 + 10*5 = 50 m/s

10 seconds

v = 0 + 10*10 = 100 m/s

the speed changes by 10 m/s

v = u + at

80 = 0 + 10*t

t = 8s

after t = 8s te speed is reached 80 m/s

344 = 0 + 10*t

t = 34.4s = 34s

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