Physics

# Problems

PhysicsProblems

### 8.1Linear Momentum, Force, and Impulse

16.
If a force of $50 upper N$ is applied to an object for $0.2 s$, and it changes its velocity by $10 m slash s$, what could be the mass of the object?
1. $1 kg$
2. $2 kg$
3. $5 kg$
4. $250 kg$
17.

For how long should a force of 130 N be applied to an object of mass 50 kg to change its speed from 20 m/s to 60 m/s?

1. 0.031 s
2. 0.065 s
3. 15.4 s
4. 40 s

### 8.3Elastic and Inelastic Collisions

18.

If a man with mass 70 kg, standing still, throws an object with mass 5 kg at 50 m/s, what will be the recoil velocity of the man, assuming he is standing on a frictionless surface?

1. −3.6 m/s
2. 0 m/s
3. 3.6 m/s
4. 50.0 m/s
19.
Find the recoil velocity of a $65 kg$ ice hockey goalie who catches a $0.15 kg$ hockey puck slapped at him at a velocity of $50 m slash s$. Assume that the goalie is at rest before catching the puck, and friction between the ice and the puck-goalie system is negligible.
1. $negative 0.12 m slash s$
2. $0 m slash s$
3. $0.12 m slash s$
4. $7.5 m slash s$