Aball is launched from a cliff with and initial velocity of 15 m/s at an angle of 40 above horizontal. if the ball lands 17.5 m away, determine the height of the cliff.

Explanation:

Evaluate in the x direction to find the time it takes to land:

x = x₀ + v₀ₓ t + ½ aₓ t²

17.5 = 0 + (15 cos 40) t + ½ (0) t²

t = 1.52

Evaluate in the y direction to find the initial height:

y = y₀ + v₀ᵧ t + ½ g t²

0 = h + (15 sin 40) (1.52) + ½ (-9.8) (1.52)²

h = -3.32

The cliff is actually 3.32 meters below where it lands.  Make sure you copied the problem correctly.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )