A particle of mass 0.3 kg is subjected to a force F = –kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin

1. 5 m/s²

2. 10 m/s²

3. 3 m/s²

4. 15 m/s²

A man is standing at a spring platform. Reading of spring balance is 60 kg-wt. If a man jumps outside the platform, then reading of spring balance:

1. first increases then decrease to zero.

2. decreases.

3. increases.

4. remains same.

A body of mass 5 kg is suspended by a spring balance on a smooth inclined plane as shown in the figure. The spring balance measure:

1. 50 N

2. 25 N

3. 500 N

4. 10 N

A block of mass 4 kg is suspended through two light spring balances A and B. Then A and B will read respectively 

1. 4 kg and zero kg

2. Zero kg and 4 kg

3. 4 kg and 4 kg

4. 2 kg and 2 kg