Question

3. A load of mass 30 kg is lifted up by
70 m. Calculate the work done. (Take
8 = 9.8 ms.)​

Answer 1

Answer:

ANSWER

Mass of the car = 2000 kg

Height at which car is lifted = 30 m

Power supplied by crane is = P =

t

mgh

=

60

2000∗9.8∗30

= 9800

Answer 2

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★ Sᴏʟᴜᴛɪᴏɴ :-

Given ,

• Mass = 30 kg
• Distance = 70 m
• Acceleration due to gravity = 9.8 m/s²

We need to find ,

• Work done = ?

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To find work done , firstly we need to find force acted.

F = m × a

Where

• F → Force = ?
• m → mass = 70 kg
• a or g → acceleration due to gravity = 9.8 m/s²

Substituting we have,

→ 30 × 9.8

→ F = 294 N

Now, finding work done.

W = F . S

Where

• W → work = ?
• F → force = 686 N
• S → distance = 70 m

Substituting we have

→ W = 294 × 70

→ Work = 20580 J

Hence , worked done = 20580J

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