Question

26. Two plates each of the mass m are connected by a massless
spring as shown. A weight w is put on the upper plate which
compresses the spring further. When w is removed, the
entire assembly jumps up. The minimum weight w needed
for the assembly to jump up when the weight is removed is
just more than
(a) mg
b) 2mg
(c) 3mg
(d) 4mg​

Answer 1

Answer:

the answer is Mg

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Answer 2

Answer:

A weight W is put on the upper plate which compresses the spring further. When W is removed, the entire assembly jumps up. The minimum weight W needed for the assembly to jump up when the weight is removed is just more than

Explanation:

mg

2mg

3 mg

4 mg

Solution :

−mg×x0+12k(x20−02)=0

2mgk=x0=mgk+Mgk

M=m