Question

Sam, whose mass is 78 kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 180 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 10 s . Part A What is Sam's top speed?

Answer 1

Answer:13.2 m/s

Step-by-step explanation:

Given

mass of sam
`\left ( m\right )=78 kg`

Thrust force=180 N

coefficient of kinetic friction
`(\mu _k)=0.1`

Force acting on sam is thrust force, friction force

`f_r=\mu _kmg=0.1* 78* 9.8=76.44 m/s`

`F_(thrust)-f_r=ma`

`180-76.44=78* a`

`a=1.32 m/s^2`

Therefore its top speed is

v=u+at

here u=0 initial velocity

`v=0+1.32* 10=13.2 m/s`