This is psychology and not physics by the way , it occurs from direct instruction or observation <span />
For the horizontal component <u>we have:</u>
Vx = Vo * cos α
Replacing we have:
Vx = 24 * cos 45°
Resolving:
Vx = 24 * 0.525...
Vx = 12.607
The horizontal velocity is <u>12,607 m/s.</u>
I think it is c because it was slowing down I don’t know for sure
B) Applied and gravitational forces
The car's speed was zero at the beginning of the 12 seconds,
and 18 m/s at the end of it. Since the acceleration was 'uniform'
during that time, the car's average speed was (1/2)(0 + 18) = 9 m/s.
12 seconds at an average speed of 9 m/s ==> (12 x 9) = 108 meters .
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That's the way I like to brain it out. If you prefer to use the formula,
the first problem you run into is: You need to remember the formula !
The formula is D = 1/2 a T²
Distance = (1/2 acceleration) x (time in seconds)²
Acceleration = (change in speed) / (time for the change)
= (18 m/s) / (12 sec)
= 1.5 m/s² .
Distance = (1/2 x 1.5 m/s²) x (12 sec)²
= (0.75 m/s²) x (144 sec²) = 108 meters .
