Answer:
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Explanation:
Answer:
A. 19.6 m/s
B. 44.6 m
C. 5.0 s
D. -19.6 m/s
Explanation:
At the highest point, the stone's velocity is 0.
A. Given:
v = 0 m/s
t = 2 s
a = -9.8 m/s²
Find: v₀
v = at + v₀
0 = (-9.8)(2) + v₀
v₀ = 19.6 m/s
B. Given:
y₀ = 25 m
t = 2 s
v₀ = 19.6 m/s
a = -9.8 m/s²
Find: y
y = y₀ + v₀ t + ½ at²
y = 25 + (19.6)(2) + ½(-9.8)(2)²
y = 44.6 m
C. Given:
y₀ = 25 m
y = 0 m
v₀ = 19.6 m/s
a = -9.8 m/s²
Find: t
y = y₀ + v₀ t + ½ at²
0 = 25 + (19.6)t + ½(-9.8)t²
0 = 4.9t² − 19.6t − 25
t ≈ 5.0 s
D. Given:
v₀ = 19.6 m/s
a = -9.8 m/s²
t = 4 s
Find: v
v = at + v₀
v = (-9.8)(4) + 19.6
v = -19.6 m/s
The velocity is -19.6 m/s. If you want the speed, or magnitude of the velocity, take the absolute value: 19.6 m/s.
Oceans, lakes and rivers are some
Total distance between Sally's house and mall = 10 kilometers
Distance covered during half way drive = 
Kilometers
Now, she goes back to her home.
Distance covered going back home = Kilometers
Now, she drives from home to mall.
Distance covered from Sally's home to mall = 10 kilometers
Hence, the total distance Sally traveled = 5 + 5 + 10
Total distance Sally traveled = 20 kilometers
Hence, the answer is 20 kilometers
