A student claims that two cars of equal mass, one moving at 40 km/h and another at 80 km/h, have the same kinetic energy if their engines provide the same power. What is the error in this reasoning?

Question

A student claims that two cars of equal mass, one moving at 40 km/h and another at 80 km/h, have the same kinetic energy if their engines provide the same power. What is the error in this reasoning? — Exam MCQ

rrbjepyq.in · Accepted Answer

B. Kinetic energy depends on the square of speed, not just on power supplied. — A convex lens forms a real, inverted and diminished image when the object is placed beyond 2F. Therefore, a smaller image of the tree indicates that the tree is beyond twice the focal length.

rrbjepyq.in · Answer

A. The cars have equal energy if the engines are identical.

rrbjepyq.in · Answer

C. Power supplied determines energy, regardless of speed.

rrbjepyq.in · Answer

D. Both cars have equal kinetic energy since both cover the same distance.

A student claims that two cars of equal mass, one moving at 40 km/h and another at 80 km/h, have the same kinetic energy if their engines provide the same power. What is the error in this reasoning?

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