Work Energy Quiz

How much work would it take to stop a car with

a mass of 1200 kg moving at a speed of 42 m/s over 8 s and a distance of 70 m?

• $2.52\ x\ 10^5\ J$

• $3.15\ x\ 10^5\ J$

• $3.78\ x\ 10^5\ J$

• $4.41\ x\ 10^5\ J$

From what height would you need to drop a car for it to be moving at 44 m/s just before it hit the ground?

• 81.6 m

• 90.0 m

• 98.8 m

• 108.0 m

A car approaches a hill with a speed of 42 m/s. How far up the hill will the car coast if the hill has an incline of 35^◦?

• 142.3 m

• 156.9 m

• 172.2 m

• 188.2 m

The force constant of a spring is 150 N/m. How much work is done to stretch the spring to 0.7 m?

• 37.5 J

• 54.0 J

• 73.5 J

• 96.0 J

A linear elastic spring can be compressed 3.0 m by an applied force of 5.0 N. A 4.5 kg crate of apples, moving horizontally at 11.0 m/s collides with the spring. What will be the maximum compression of the spring?

• 18.1 m

• 19.7 m

• 21.4 m

• 23.0 m

A 14.0 kg pumpkin is launched straight up using a vertical spring (k=900). If the pumpkin goes up 1.75 m above the spring equilibrium position, how far was the spring compressed to shoot the pumpkin up that high?

• 0.62 m

• 0.68 m

• 0.73 m

• 0.78 m