What is he total resistance? A. 20 ohms B. 90 ohms C. 40 ohms D. 30 ohms
2 answers:
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Answer:
21.6 km
Explanation:
15×60×24 = 21600 m
= 21.6 km
Consider the upward direction of motion as positive and downward direction of motion as negative.
a = acceleration due to gravity in downward direction = - 9.8
v₀ = initial velocity of rock in upward direction = ?
v = final velocity of rock at the highest point = 0
t = time to reach the maximum height = 4.2 sec
Using the kinematics equation
v = v₀ + a t
inserting the values
0 = v₀ + (- 9.8) (4.2)
v₀ = 41.2