Provides some background for this problem. a ball is thrown vertically upward, which is the positive direction. a little later i t returns to its point of release. the ball is in the air for a total time of 7.70 s. what is its initial velocity? neglect air resistance.
1 answer:
For an object thrown vertically upward, its time of flight is equal to the equation below: t = 2v/g where t is the time of flight v is the initial velocity g is the acceleration due to gravity equal to 9.81 m/s² Substituting the values, 7.07 = 2v/9.81v = 34.68 m/s
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Answer:
450N
Explanation:
Given data
Mass m= 75kg
Acceleration= 6m/s^2
From the Newtons first law, F=ma
substitute
F=75*6
F= 450N
Hence the force is 450N
Becasue when you rubbed your hair while you were putting on your sweater it caused it to rub against together causing electricity thingy lol. and thats why your hair goes straigh tup.
Answer:
The answer should be A and B. I don't fully know so don't quote me on that! Haha.
Explanation:
Answer:
m=3kg
Explanation:
Momentum=mass×speed
60[kg m/s]=m[kg]×20[m/s]
We get:
m=3kg
Answer:
V = -0.3 m/sec .
Explanation:
5.0 x 0.12 + 2.0 x v = 0. Which means that V = -0.3 m/sec.
The -ve sign shows it moves in the opposite direction.