Ball thrown down simplify for time. HELP

[reltz]

Homework Statement

A student throws a ball downward at a velocity of 8.0m/s from a height of 25m. How long until it hits the ground? What is the velocity of the ball as it hits the ground.

Homework Equations

What is thee formula when simplifying for T(time)?

The Attempt at a Solution

When using the formula d=ViT + 1/2a*d I get 3.4s, but the answer is 1.6s.

 

[LowlyPion]

Homework Statement

A student throws a ball downward at a velocity of 8.0m/s from a height of 25m. How long until it hits the ground? What is the velocity of the ball as it hits the ground.

Homework Equations

What is thee formula when simplifying for T(time)?

The Attempt at a Solution

When using the formula d=ViT + 1/2a*d I get 3.4s, but the answer is 1.6s.

Welcome to PF.

Maybe think more in terms of

x = Vi*t + 1/2*g*t²

 

[reltz]

now I am still getig high answers... how do i simplify for t?

 

[LowlyPion]

now I am still getig high answers... how do i simplify for t?

Didn't you get a quadratic equation? Use the quadratic formula. I don't think one of the solutions is too large.