Five questions at once? You would be better helped to make it one question per post. Few volunteer tutors have time to sit down and do all five at one sitting. I will do a couple, maybe that will help you on the others. We do much better critiquing your WORK, as it is one wonders if you are an answer grazer.
First one: time in air.
hf=hi+vi*t-4.8t^2 *vi is initial vertical speed*
0=64.8-4.8t^2
t= sqrt(64.8/4.8)= your guess is the best answer.
fourth one:
convert 60 ft 6in to m: 18.4m
time in air: 18.4m/42m/s=.44 sec
hf=hi-4.8t^2
hf=0-4.8(.44^2)=.93m fell
PLEASE HELP!
A person throws a rock horizontally off a cliff ata a speed of 9 m/s from a point 64.8 m above the ground. How long is the rock in the air?
13.2 s
26.4 s
3.64 s(my guess)
5.14 s
A package falls from an airplane in level flight at constant speed. If air resistance can be neglected, how does the motion of the package look to the pilot.
The package appears to travel in the shape of a parabola.
The package appears to fall straight downward.(my guess)
The package appears to travel backward.
The package appears to fall backward and downward.
A paintball is shot horizontally in the positive x direction. At time Trianglet after the ball is shot, it is 4 cm to the right and 4cm below it’s starting point. At time 2trianglet, what is the position of the ball relative to it’s starting point. Ignore air resistance.
12 cm to the right and 16 cm below
8cm to the right and 8 cm below
12 cm to the right and 8 cm below
8 cm to the right and 16 cm below(my guess)
A baseball pitcher throws a fastball horizontally at a speed of 42.0 m/s. Ignoring air resistance, how far does the ball drop between the pitcher’s mound and home plate, 60 ft 6in away?
0.945 m
2.15 m
1.02 m
0.382 m
A rescue plane spots a person floating in a lifeboat 55 m directly below and releases an emergency kit with a parachute. The package descends with a constant vertical acceleration of 6.91 m/s. If the horizontal speed of the plane was 70.6 m/s, how far is the package from the lifeboat when it hits the waves?
225 m
1.27 km
323 m
282 m
1 answer