A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The velocity of the ball in m/s is
a. 0.
b. 4.9.
c. 9.8.
d. 19.6.
e. none of these.
d
You might also like to view...
The circuit power factor of an RL circuit connected across an ac source is one. What would be a good description of the frequency of this source?
A) Low B) Very low C) High D) Very high
That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about one solar mass implies:
A) that white dwarfs evolve slower than main sequence stars. B) that the collapsed companion transferred mass to Sirius A. C) that there should be a planetary nebula around the Sirius system. D) that Sirius A will be stable three times longer than Sirius B. E) the Sirius A will end up as a black hole, not a white dwarf like its companion.
The number of neutrinos in the universe is greater than all the protons, neutrons, and electrons combined
Indicate whether the statement is true or false
A 0.28-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 500 N/m. The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest
The block then executes simple harmonic motion along the horizontal x-axis. When the displacement is x = -0.052 m, find the acceleration of the block. A) 92 m/s2 B) 46 m/s2 C) 69 m/s2 D) 230 m/s2 E) 280 m/s2