Rougher surfaces have more friction between them
Answer:
The recoil velocity is 0.819 m/s.
Explanation:
Given that,
Mass of ball m= 7.5 kg
Velocity v= 8.85 m/s
Mass of performer m'= 73.5 kg
Suppose if the performer is on nearly friction less roller skates, we need to calculate his recoil velocity
We need to calculate the recoil velocity
Using law of conservation momentum
Where, m = mass of ball
m' = mass of performer
v = velocity of ball
Put the value into the formula
Put the value into the formula
Hence, The recoil velocity is 0.819 m/s.
Answer:1 because
Explanation: it’s pointing to the earth and gravity
Pulls things down to earth