A ball is thrown vertically with an initial velocity of 20 m/s from a height of

Question

A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ?
A. 2.5 m/s B. 20 m/s C. 24.78 m/s D. -20 m/s A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ?
A. 2.5 m/s B. 20 m/s C. 24.78 m/s D. -20 m/s A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ?
A. 2.5 m/s A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ? A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ? A ball is thrown vertically with an initial velocity of 20 m/s from a height of 30 m. Neglecting any air resistance what is the magnitude of the velocity when the ball strikes the ground ?
A. 2.5 m/s B. 20 m/s C. 24.78 m/s D. -20 m/s

Explanation / Answer

Given that,

u = 20 m/s

h = 30 m

Let, the  velocity when the ball strikes the ground = v

From law of energy conservation,

PEi + KEi = PEf + KEf

mgh + (1/2)mu^2 = 0 + (1/2)mv^2

9.8*30 + (1/2)*20^2 = (1/2)*v^2

v = 31.4 m/s

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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