Question

an ice skater is moving at a speed of 2 mi/hr when she slams into a wall 0.05 hours later. what is her acceleration?

Answer 1

Answer:

0.00497m/s²

Explanation:

Acceleration is defined as the change in velocity of a body with respect to time. Mathematically,

Acceleration = change in velocity/time

Given velocity = 2miles/hour

Converting mi/hr to m/s,

1mi/hr = 0.447m/s

2mi/hr = 2×0.447

= 0.894m/s

Time taken to slam into a wall = 0.05hours

Converting this to seconds will give;

0.05×60×60

= 180seconds

Acceleration = 0.894/180

Acceleration = 0.00497m/s²

Answer 2

$v_{f} = v_{0}+at$
at $v_{f}=0$
$v_{0}=at$
$-2=0.05a$
$a= \frac{-2}{0.05} =-40mi/hr$

Hope this helps.