Question

2
19. Soni says that the acceleration in an object could be zero
even when several forces are acting on it. Do you agree with
her? Why?
20. Find the energy in kW h consumed in 10 hours by four
devices of power 500 W each.
21. A freely falling object eventually stops on reaching the
ground. What happenes to its kinetic energy?
in
th​

Answer 1

Answer:

19.Yes, I agree with Soni . This is because acceleration in an object could be zero even when several forces are acting on it if the resultant force( F) is zero. ... Now , when force, F= 0, then acceleration(a) has to be zero because mass (m) cannot be zero.

20.Hence, the energy consumed by four equal rating devices in 10 h will be 4 — 5 kWh = 20 kWh = 20 Units.

21.As the object hits the hard ground, all its kinetic energy gets converted into heat energy and sound energy. ...

Explanation:

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