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The following units are covered :

- Motions and Forces
- Conservation of Energy and Momentum
- Heat and Thermodynamics
- Waves
- Electric and Magnetic Phenomena.

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Retarding force F = 100N or

Force F = -100N,

mass m = 20 kg,

Initial Velocity (u) = 15 m/s,

Final Veloctiy (V) = 0

From Newtons Second Law, F = ma

-100N = 20Kg $\times$ a

Acceleration (a) = $\frac{-100 N}{20 kg}$

= - 5m/s

But we also know that a = $\frac{V-U}{t}$

-5 = $\frac{0-15}{t}$

-5t = -15

t = 3s.

Time required to stop the body = 3s.

From Newtons second law, F=ma

Initial Velocity (u) = 0,

Final Velocity (V) = 5m/s,

Time (t) = 1 min = 60 s.

$\therefore$ Acceleration = a = $\frac{V-U}{t}$

= $\frac{5-0}{60}$

= $\frac{1}{12}$ m/s

Force = ma = 10 $\times$ $\frac{1}{12}$

= $\frac{10}{12}$

= 0.833 N.

The Physics answers are mentioned as per the curriculum. The Concepts are dealt in depth so that the students can gain maximum benefit out of that. The diagrams, tabular column, equations and all are represented in a systematic way to know about any topic in a better way.

From Newtons Second law, F = ma.

Let force acting on the object when the mass is doubled be equal to F

i.e., Mass(m

Acceleration produced = a

F

given F = F

$\therefore$ ma = 2 ma

a = 2a

Acceleration, a

Thus, acceleration is reduced to half of the given acceleration if mass is doubled.

(a) State two characteristics of wave motion.

(b) What is the relation between frequency, wavelength and speed of a wave?

(a)A wave motion is periodic in nature.The particles of the medium do not move from their mean position but execute vibration but only the energy is transmitted from one point to another.

(b) v = $\lambda$ $\times$ f

where V = Velocity,

$\lambda$ = wavelength,

f = frequency.

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