Question

An ice skater slides in a straight line across the ice. As she passes a certain point, her velocity is 24 km/hr. Two seconds later it is 13 km/hr. What is the acceleration of the skater?

Answer 1

The believe the answer is-11km/hr/sec

Answer 2

Answer : Acceleration,
`a=-1.525\ m/s^2`.

Explanation :

It is given that,

Initial velocity of skater, u = 24 km/h = 6.66 m/s

Final velocity of skate, v = 13 km/h = 3.61 m/s

Time, t = 2 s

We know that acceleration is defined as the rate of change of velocity.

`a=(v-u)/(t)`

So,

`a=(3.61\ m/s-6.66 m/s)/(2\ s)`

`a=(-3.05)/(2)`

`a=-1.525\ m/s^2`

The acceleration of the skater is
`a=-1.525\ m/s^2`.