an object starts from rest with an acceleration of 5.0m/s2. how fast is the obje

Question

an object starts from rest with an acceleration of 5.0m/s2. how fast is the object going after 17.0 seconds? How far has the object traveled in 17.0 seconds?

a ball is thrown straight up with a velocity of 25.0m/s. use g=9.8 m/s2 down. how long does it take the ball to return to the same height at which it left the thrower's hand

a golfer hits a ball fromm a tee to a green. the ball leaves the club at a speed of 22.4 m/s at an angle of 40.0 degrees above horizontal. The tee and the green are at the same elevation. Ignore air resistance. How much time does the ball spend in the air? Whatis the longest horizontal distance the ball can travel? Ignore rolling when the ball hits the ground

Explanation / Answer

(a) v=u+ft : v=0+(5*17)=85m/s v2=u2+2fs: 852=0+2*5*s : s=722.5m

(b)v=u+ft: 0=u-gt :t=u/g (upward motion) similarly t=u/g (downward motion)

total time=(2*u/g)=5.10s

(c) time of flight =(2*v*sin theta)/g =2.93 s

horizontal range= (v2*sin 2theta)/g =50.44m

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