Question

Two masses 10 kg and 20 kg are connected by a massless spring. A force of 200 N acts on 20
kg mass. At the instant when the 10 kg mass has an acceleration 12 m/s, find the energy stored
(in Joule) in the spring (k = 2400 N/m).​

Answer 1

Answer:

m 1 = 10kg;m

2

=20kg;F

2

=200N;a

1

=12ms

−2

;a

2

=?

For mass m

1

; F=m

1

a

1

=10×12=120N

For mass m

2

;

200−F=20a

2

200−120=20a

2

a

2

=

20

80

=4ms

−2