Question

Ravi and ramesh Having masses 25kg and 35kg standing at a height 20m from Ground. Who is having more potential Energy. Explain

Answer 1

Answer:

Correct option is

A

320 J

mass of girl m=35kg

mass of trolley=5kg

total mass=40kg

initial velocity of trolley u=4ms

−1

final velocity of trolley v=0ms

−1

distance s=16m

we know,

v

2

−u

2

=2as

a=

2s

v

2

−u

2

=−

2×16

16

a=−

2

1

ms

−2

Force=ma=40×(−0.5)

=-20N

work is done on the trolley=20N×16m=320 J.

work was done by the girl =0 J.

Answer 2

Answer:-

Case-1:-

• Mass of Ravi=25kg
• Height=20m
• Acceleration due to gravity=g=10m/s^2

We know that

$\boxed{\sf E_{P}=mgh}$

$\\ \sf{:}\longrightarrow E_{P_1}=25\times 10\times 20$

$\\ \sf{:}\longrightarrow E_{P_1}=500\times 10$

$\\ \sf{:}\longrightarrow E_{P_1}=5000J$

Case-2:-

• Mass of Ramesh=35kg
• Height=20m
• Acceleration due to gravity=g=10m/s

$\\ \sf{:}\longrightarrow E_{P_2}=35\times=20\times 10$

$\\ \sf{:}\longrightarrow E_{P_2}=700\times 10$

$\\ \sf{:}\longrightarrow E_{P_2}=7000J$

Ramesh has more potential energy than Ravi.