Mr Megargeo drops an object from the top of a bridge that th

Mr. Megargeo drops an object from the top of a bridge that the 18 meters from the ground. How long does It take the object to fall to the ground7 Mr. Harris throws an object down at 20 m/s from the top of a bridge. It hits the ground at 60 m/s. How high is the bridge? A ball is thrown straight up with a speed of 30 m/s. What Is the ball\'s displacement after 4 seconds? How high does it go?

Solution

1.

Here

V_i=0 m/s

d=18 m

a=9.8 m/s²

since

d =V_it+(1/2)at²

18 =0+(1/2)*9.8*t²

t=1.92 s

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2.

Since

V_f=V_i+at

60 =20+9.8*t

t=4.08 s

Since

h =V_it + (1/2)at² =20*4.08 + (1/2)(9.8)*4.08²

h=163.3 m

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