Agun has a muzzle speed of 80 meters per second. what angle of elevation should be used to hit an object 180 meters away? neglect air resistance and use g=9.8m/sec2 as the acceleration of gravity.

the answer must be in radians.

i found: angle=1/2arcsin (180*9.8)/(80^2), but it was not correct.

I hope I was able to answer your question. Have a good day.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

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