Question

(Ans: 6 m)
d. The velocity of a car increase from
54 km/hr to 72 km/hr. How much is
the work done if the mass of the car
is 1500 kg ?
(Ans. : 131250 J)
e. Ravi applied a force of 10 N and
moved a book 30 cm in the direction
of the force. How much was the
work done by Ravi?
(Ans: 3J)



anyone solve it please.....​

Answer 1

Answer:

d.) Work done = 131250 joules

e.) Work done by Ravi = 3 j

Step by step explanations :

d.) Given that,

the velocity of car increases from 54 km/h to 72 km/h

here,

initial velocity of the car = 54 km/h

= 54 × 1000/3600 m/s

= 15 m/s

final velocity = 72 km/h

= 72 × 1000/3600 m/s

= 20 m/s

given mass = 1500 kg

Work done = change in kinetic energy

Work done = ½ m(v² - u²)

where,

m = mass

v = final velocity

u = initial velocity

putting the values,

Work done = ½ × 1500 (20² - 15²)

= 750(400 - 225)

= 750(175)

= 131250 j

so,

Work done = 131250 joules

______________

e ) Given that,

Force applied by Ravi = 10 N

displacement = 30 cm

= 0.3 m

Work done by Ravi = force × displacement

putting the values,

Work done = 10 × 0.3

= 3 j

so,

Work done by Ravi = 3 j

Answer 2

Explanation:

Hope this helps uh......... ♥️