Answer:d
Explanation:
Spring is compressed to a distance of x from its equilibrium position
Work done by block on the spring is equal to change in elastic potential energy
i.e. Work done by block 
therefore spring will also done an equal opposite amount of work on the block in the absence of external force
Thus work done by spring on the block 
Thus option d is correct
Answer:
a) battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy
Explanation:
Use Scoratic it works with any time of subject
PLS help ASAP I DONT have time to answer this, it also detects if it’s right or wrong.
With gravitational acceleration at 9.8, initial height at 3.5m and distance at 22m the initial horizontal velocity is 26.03 ms and the flight time is .845 seconds