Question

periodic motion?
17. Write the SI unit for the universal gravitational
constant (G).
18. A tennis ball of mass 'm' strikes a massive wall with
a velocity V and traces back the same path. Calculate
the change in momentum of the ball due to the wall.
19. Name the physical quantity corresponding to force in
rotational motion and write its units?
20. What does speedometer of vehicle measure? 2
21. The mean value of period of oscillation of a simple
pendulum in an experiment 2.825. The arithmatic mean
of all the absolute errors is 0.11 s. Round off the period​

Answer 1

Answer:

17. nm^2/kg^2

19. vector quantity , si unit . m/s

20. speed