### Class XI

mass and energy are equivalent and are related by
1. E = mc2
2. E = 2mc2
3. E = mc2/2
4. E = mc3
A rain drop of mass 2.00 g falls from a height 1.00 km. It hits the ground with a speed of 50.0 m/s. What is the work done by the gravitational force? (Take g = 10 m s−2s−2)
1. 26 J
2. 20 J
3. 22 J
4. 24 J
In a graph of F(x) vs x, the area under the curve
1. represents the momentum of F(x).
2. represents energy of F(x).
3. represents work done by F(x).
4. represents the impulse of F(x)
A 50.0-kg marathon runner runs up the stairs to the top of a 443-m-tall Tower. To lift herself to the top in 15.0 minutes, what must be her average power output?
1. 261 W
2. 221 W
3. 241 W
4. 201 W
A 0.800-kg ball is tied to the end of a string 1.60 m long and swung in a vertical circle. (a) During one complete circle, starting anywhere, calculate the total work done on the ball by (i) the tension in the string and (ii) gravity
1. 30 J, 30 J
2. 0, 0
3. 10 J, 10 J
4. 25 J, -25 J
0
0

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