A strong spring is stretched 10 cm by a suspended block. If the block's weight is doubled, the spring will stretch to
A)15 cm.
B)20 cm.
C)40 cm.
D)its elastic limit.

Question

Quizplus · Accepted Answer

The stretch of a spring is directly proportional to the weight applied to it. Therefore, if the weight is doubled, the stretch will also double. This means that the spring will stretch 20 cm [(10 cm x 2) = 20 cm]. Choice A is incorrect as a weight increase of 2 times does not equal a stretch increase of 1.5 times. Choice C is also incorrect as a weight increase of 2 times does not equal a stretch increase of 4 times. Choice D is incorrect as there is no information given about the spring's elastic limit.

A Strong Spring Is Stretched 10 Cm by a Suspended