It's physics grade 10 and I just don't know what formula to use or how to solve these

3 years ago

Answered By Ryan H

Th0

3 years ago

Answered By Ryan H

The initial velocity is the unknown, desired quantity. Perhaps the thing the realize is: the final velocity is 0, at the given displacement. So we have a v_{f }, d, and a (is equal to g, the acceleration due to gravity), and we want to solve for v_{i}.

The required equation is then:

v_{f}^{2} = v_{i}^{2 }+ 2ad

v_{i} = square-root( 0-(2*(-9.81)0.91)

Note that the acceleration due to gravity is given a negative sign here, as it's opposing the initial velocity, slowing the athlete to 0 m/s at the maximum height.

Note that the mass of the athlete is not used to solve the problem; we are close to the Earth's surface, and the force of gravity is not varying in this problem, so the acceleration is constant.

3 years ago

## Answered By Ryan H

Th0

3 years ago

## Answered By Ryan H

The initial velocity is the unknown, desired quantity. Perhaps the thing the realize is: the final velocity is 0, at the given displacement. So we have a v

_{f }, d, and a (is equal to g, the acceleration due to gravity), and we want to solve for v_{i}.The required equation is then:

v

_{f}^{2}= v_{i}^{2 }+ 2adv

_{i}= square-root( 0-(2*(-9.81)0.91)Note that the acceleration due to gravity is given a negative sign here, as it's opposing the initial velocity, slowing the athlete to 0 m/s at the maximum height.

Note that the mass of the athlete is not used to solve the problem; we are close to the Earth's surface, and the force of gravity is not varying in this problem, so the acceleration is constant.