A large coil spring with a spring constant k = 120 N/m is elongated, within its elastic range by 1 m. Compute the store energy of the spring in N-m.

Consider an object is moving with constant acceleration, its velocity must_______

1. Increase

2. Decrease

3. Be constant

4. May increase or decrease

Which example of the change in velocity will produce an acceleration

1. A boy running on a road with constant speed

2. A vehicle running with 50 m/sec speed

3. An object performing circular motion with constant speed

4. A particle moving in the vacuum with constant speed

Identify two true statements about projectiles among the following

1. The horizontal component of velocity always remains constant during projectile

2. The vertical component of velocity remains constant during projectile

3. The vertical component of velocity changes due to the downward gravity

4. The kinetic energy becomes zero at maximum height