Question

A TROLLY WITH LUGGAGE of 70 kg is moving with a initial velocity of 8m/s by applying a force. the trolley comes to rest after covering a distance of 24km .calculate work done by trolley.(weight of trolley is 5kg)​

Answer 1

Answer:

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:

Solution

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Correct option is A)

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.

Explanation:

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