Pleaseeee anyone can heeeelpppp
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( b)It is also possible to slow a car down by pushing on it. In this case we push opposite the direction of motion. We do negative work, which removes kinetic energy from the system.
(a) Gravitational force on the box is acting in the downward direction. Since the boy walks horizontally, his vertical displacement is zero. Hence, when a boy carrying load on his head moves over a horizontal road, work done against gravitational force is zero.
from Patna , Bihar
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