A bullet shot straight up to its starting point in 10s. Its initial speed was:?
a. 49 m/s
b. 9.8 m/s
c. 98 m/s
d. 32 ft/s
e. 24.5 m/s
How do i find the answer?? I can only choose 1
2007-05-22 13:49:06 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
It's C, the equation is V = gt
2007-05-22 13:57:31 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Ok so we will use the formula to the highest point (5 s)
Vf = Vo + at
Vf - Final Velocity
Vo - Intial velocity
a - acceleration due to gravity (9.8m/s^2)
t - time (5 s)
Vf = 0
0 = Vo - 9.81 m/s^2 (5 s)
Vo = 9.81 m/s^2 (5 s)
Vo = 49 m/s
Answer - (a)
2007-05-22 20:56:32 · answer #2 · answered by wayne 2 · 0⤊ 0⤋
Kinematics problem:
what you know:
v0 = ?
a = -9.8 m/s^2
t = 10s
dy = 0
so.....
dy = v0t + (1/2)at^2
0 = 10v + (1/2)(-9.8)(10)
49 = 10v
4.9 m/s = v = 16ft/s
Are u sure you have the numbers/answers right?
2007-05-22 20:55:04 · answer #3 · answered by J Z 4 · 0⤊ 0⤋
Kinematic Big 3 baby i love the physics these guys have it right!!! paul hewitt is king
2007-05-22 23:35:47 · answer #4 · answered by bufan5419 2 · 0⤊ 0⤋
c. I'm not exactly sure of what you mean happened.
2007-05-22 20:54:29 · answer #5 · answered by cattbarf 7 · 0⤊ 0⤋