Assertion (A): If momentum of a body increases by 50%, its kinetic energy will increase by 125%.

Reason (R): Kinetic energy is proportional to the square of velocity.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

Assertion (A): A spring has potential energy in both cases whether it is compressed or stretched.

Reason (R): This is because work is done on the spring against the restoring force.

1. both A and R are true and R is the correct explanation of A
2. both A and R are false and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Name the form of energy which a wound-up watch spring possesses.

Name the type of energy (kinetic energy K or potential energy U) possessed in the following cases:

(a) A moving cricket ball

(b) A compressed spring

(c) A moving bus

(d) A stretched wire

(e) An arrow shot out of a bow.

(f) A piece of stone placed on the roof.