Question

What impulse was delivered to the sled by the friction force from the rough spot?

Answer 1

- 80 Ns

Step-by-step explanation:

The complete statement is given as

A sled and rider, gliding over horizontal, friction less ice at 4.0 m/s, have a combined mass of 80 kg. The sled then slides over a rough spot in the ice, slowing down to 3.0 m/s. What impulse was delivered to the sled by the friction force from the rough spot?

`v_(i)` = initial velocity of the sled = 4.0 m/s

`v_(f)` = final velocity of the sled = 3.0 m/s

`m` = combined mass of sled and rider = 80 kg

`I` = Impulse delivered to sled

Using Impulse-change in momentum equation, Impulse delivered to sled is given as

`I = m (v_(f) - v_(i))\\I = (80) (3 - 4)\\I = - 80 Ns`