<u>Answer:</u> 3
H = 45 m ,
time required for the stone
S = u.t+(1/2) g.t²
45 = (1/2) 9.81. t² since u( initial velocity) = 0 ; S =H.
t² = 9.17 s
<em> t = 3.02 s </em>
therefore answer is 3 m/s
<em> if you satisfy with explanation, please give brainiest ; </em>
As we have all learned from Newton #3, every action has an equal, opposite reaction.
The force that the football exerts on the kicker's foot is <em>equal</em> to the force with which the kicker's foot impacts the ball. (<em>100 N</em>)
Explanation:
The mass of electron,
The mass of neutron,
The De-Broglie wavelength is given by :
p is the momentum, p = m v
For electron,
For neutron,
Since, an electron and a neutron have the same de Broglie wavelength. So,
The mass of electron is less than the mass of neutron. So, the speed of electron is more than than the speed of neutron. As the kinetic energy is directly proportional to the mass. So, the correct option is (a) The electron has more kinetic energy and a higher speed.
The atoms undergo a phase called radioactive decay
Answer:
Power brake is a device in vehicles which assists in braking by reducing the effort/force needed to apply the brakes on the pedal.