Question

A block of mass m is kept on frictionless plank as
shown in figure below. lf plank is pulled with a
horizontal acceleration a, then maximum
compression in the spring is (spring constant of
spring is k)​
1) mg/k
2) ma/k
3)2ma/k
4)2mg/k​

Answer 1

answer is 2

F ma

F = kx

x= ma/ k