Question

“horizontal velocity causes vertical retardation” true or false. Justify

Answer 1

Answer:

Given,

Retardation =10%

If there is no friction then,

By the equation of the motion,

v

2

=u

2

+2gh

v=0

h=

2g

u

2

Now,

When there is air resistance 10% of the gravity.

g

eff

=g+0.1g=1.1g

The maximum height will be,

h

1

=

2g

ef

u

2

Therefore, the difference is h

1

−h

u

2

2g

ef

−

2g

u

2

So,

Change in height is:

2g

u

2

−

2g

ef

u

2

=

2g

u

2

−

2g

u

2

(1−

10

11

)

Thus the percentage change in height is:

=

2g

u

2

2g

u

2

(1−

10

11

)

×100