With what minimum speed must you toss a 200 g ball straight up to hit the 15 m -

Question

With what minimum speed must you toss a 200g ball straight up to hit the 15m -high roof of the gymnasium if you release the ball 1.4m above the ground? Solve this problem using energy. Express your answer using two significant figures. With what speed does the ball hit the ground? Express your answer using two significant figures. With what minimum speed must you toss a 200g ball straight up to hit the 15m -high roof of the gymnasium if you release the ball 1.4m above the ground? Solve this problem using energy. Express your answer using two significant figures. With what speed does the ball hit the ground? Express your answer using two significant figures. With what speed does the ball hit the ground? Express your answer using two significant figures.

Explanation / Answer

a)
let v is the initial speeed of the ball

as the bullet goes up its kinetic enrgy decreases and potential enrgy increases.

initial kinetic enrgy = final potential enrgy

0.5*m*v^2 = m*g*(H-h)

v = sqrt(2*g*(H-h))

= sqrt(2*9.8*(15-1.4))
= 16.33 m/s

b)

let v is the speed of the ball when it hits the ground.

when the object falls down its potential energy decreses and kinetic energy increases.

kinetc enrgy of the ball at the ground = potential energy at the maximum height

0.5*m*v^2 = m*g*H

v = sqrt(2*g*H)

= sqrt(2*9.8*15)

= 17.15 m/s

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.