Question: 1. How much work is required to stop an electron (m=9.111031kg)(m=9.111031kg) which is moving with a speed of 2.1010 6 m/sm/s ? 2. A 22.0-kgkg

1. How much work is required to stop an electron (m=9.111031kg)(m=9.111031kg) which is moving with a speed of 2.1010⁶ m/sm/s ?

2. A 22.0-kgkg crate, starting from rest, is pulled across a floor with a constant horizontal force of 225 NN. For the first 11.0 mm the floor is frictionless, and for the next 10.0 mm the coefficient of friction is 0.20.

3. A spring has a spring stiffness constant kkk of 75.0 N/mN/m . How much must this spring be compressed to store 35.0 JJ of potential energy?

4. A 1300-kgkg car moving on a horizontal surface has speed vvv = 45 km/hkm/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.7 mm .

5.In climbing up a rope, a 78-kgkg athlete climbs a vertical distance of 4.0 mm in 9.0 ss.

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