Question

Help please!!! 100 points

Answer 1

1. baseball in air w/ no force but only gravity acting on it. gravity is constant so its acceleration is constant. ans is A.

2. use the eqn s=u*t+1/2a*t^2 where u=init vel n a=accel

s=105m,

u=0 as the rock has no vertical vel

n a=gravity=9.8m/s^2

105=0*t+1/2*9.8*t^2

t^2~23

t~5s

ans is A.

3. same eqn s=u*t+1/2a*t^2 where u=init vel n a=accel

s=1.4m,

u=0 as the marble has no vertical vel

n a=gravity=9.8m/s^2

1.4=0*t+1/2*9.8*t^2

t^2=2.8/9.8=0.2857

t=0.5345s

V=4/0.5345=7.48m/s

ans is C

Answer 2

1. Acceleration
2. If you are going 12 meters per second and you want to know how many seconds it takes yo get to 105 meters, you need yo find how long it takes to go horizontally then vertically. 12 seconds.
3. B