: XA meatball is thrown downward with initial speed of 12 m/s. What is the speed

Question

: XA meatball is thrown downward with initial speed of 12 m/s. What is the speed of the meatball after (round to nearest integer; ignore air drag; use g = 10 m/s4 1 second? [a] 2 seconds? [b] 3 seconds? [c] 4 seconds? [d] 5 seconds? [e] 10 seconds? [fl By how much does the speed of the meatball change in each second? [g] After how many seconds will the meatball reach the speed of 80 m/s? (two decimals for this answer, please)[h] After how many seconds will the meatball become supersonic i.e. exceed the speed of 344 m/s? (round to the nearest second) [i

Explanation / Answer

We will use the kinematic equation

v=u+gt

(a) after 1 sec

v=12+10X1 or v=22 m/s

(b) after 2 sec

v=12+10X2 = 32 m/s

(c) after 3 sec

v=12+10X3 = 42 m/s

(d) after 4 sec

v=12+10X4 = 52 m/s

(e) after 5 sec

v=12+10X5 = 62 m/s

(f) after 10 sec

v=12+10X10 = 112 m/s

(g) change per unit time is nothing but acceleration, which in this case is g i.e 10 m/s2

(h) let time taken be T

80=12+10T or T=6.8 sec

(i) again let time taken be T

344=12+10T or T=(344-12)/10 =33.2 sec

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