Choose the correct options for the following questions.
A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against friction is:
Difficulty: Easy
A:
$5 \times 10^{1} J$
B:
$5 \times 10^{2} J$
C:
$5 \times 10^{3} J$
D:
$5 \times 10^{4} J$
A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:
Difficulty: Easy
A:
$0^{\circ}$
B:
$30^{\circ}$
C:
$60^{\circ}$
D:
$90^{\circ}$
A labourer carrying a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:
Difficulty: Easy
A:
Minimum work
B:
Maximum work
C:
Zero work
D:
Negative work
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