- #1

Taylan

- 52

- 1

## Homework Statement

A frog jumps at t=0s and follows a projectile motion. The maximum height he reaches is 0.45m. The air resistance can be neglected.

a) What is the initial speed of the frog in y-direction and how long is the total time until he lands on the ground?

b) At which degree should he jump from the horizontal plane, to be able to reach a horizontal range of 3m?

## Homework Equations

v^2=u^2+2as

v=d/t[/B]

## The Attempt at a Solution

In part a I wrote down what I know about the vertical motion.

=> finding initial speed in y-direction

s=0.45m

u=?

v=0m/s

a= -9.81m/s^2

v^2=u^2+2as

u=2.97m/s

=> finding the total time of the flight

s=0m

u=2.97m/s

a=-9.81m/s^

T=?

s=ut+1/2at^2

t=0.61sFor part b I am confused. So the velocity in horizontal direction is always the same so I can use v=d/t

I know d=3m. I don't know the initial velocity or time it would take for a range of 3m. Can you give me some tips?