Light is either potential energy or kinetic.

When you talk about Hooke's law, it always have to do something with springs. Hooke's Law, from Robert Hooke, saw a relation between the force applied to the spring and the extension of its length. The equation is: F = kx, where k is the spring constant and x is the displacement of the original and stretched lengths. In other words, x is the length of deformation. Hence, the object must be elastic to come up with a displacement or deformation, in the first place. Then, the Hooke's Law is only applicable to elastic materials.

**Answer:**

**Explanation:**

Considering it to be True or False Statements

(a)True ,

when Potential Energy of the system is zero then force on the object is zero

(b)True

When ball is thrown upward it faces air resistance of greater magnitude because of the high speed of ball. while on returning the speed of ball gradually increase therefore it take more time to reach same spot

(c)True

Change in gravitational Potential Energy of two balls will be different as gravitational Potential Energy depends on the distance of object from datum.

Also Potential Energy can also be negative as it depends on reference

(d)False

if Force on object is zero then Potential Energy is constant not zero

i.e.

**Answer:**

Lets take

u =velocity

θ =angle from horizontal

The horizontal component of velocity = u cosθ

The vertical component of velocity = u sinθ

The horizontal distance x in time t

x = u cosθ .t -----------1

The vertical distance y in time t

--------2

t= x/(u cosθ) ( tanθ=sinθ/cosθ)

Form above we can say that path of the projectile motion is parabolic.

5.3

Is the answer lol am i right…??….