A body of mass 70kg is moving with a velocity of 32 km/hr.
what is the work done ??
Answers
Answered by
1
mass of body (m) = 70 kg
velocity of body(v) = 32km/h
so convert this velocity in m/s
velocity in m/s = 32 × 5/18 = 80/9m/s
◆ when body of mass moves with velocity it has kinetic energy associated with it .
work done needed = kinetic energy
kinetic energy = 1/2 × mv^2
=1/2×70 ×(80/9)^2
= 35 × 8.88
= 310.8 Joule
approx 311 joule
so work done = 311 J
_____-------_______---____---_______
HOPE IT WILL HELP U....
velocity of body(v) = 32km/h
so convert this velocity in m/s
velocity in m/s = 32 × 5/18 = 80/9m/s
◆ when body of mass moves with velocity it has kinetic energy associated with it .
work done needed = kinetic energy
kinetic energy = 1/2 × mv^2
=1/2×70 ×(80/9)^2
= 35 × 8.88
= 310.8 Joule
approx 311 joule
so work done = 311 J
_____-------_______---____---_______
HOPE IT WILL HELP U....
Anonymous:
32*5/18 = 8.88 [ approx.]
u wlcm
-_-
ya i done calculation mistake
wait
np
change kiya ?
yess
good !!!!
^_^
Answered by
0
Given,
Mass m = 70 kg
Velocity v = 32 km/hr
= 32 * 5/18
= 80/9 m/s
The work done on an object by a net force equals the change in kinetic energy of the object.
So,
W = Ek
= 1/2mv²
= 1/2 * 70 * (80/9)²
= 35 * (6400*81)
= 2765.43 J Ans.
Ans.) The work done is 2765.43 J.
Mass m = 70 kg
Velocity v = 32 km/hr
= 32 * 5/18
= 80/9 m/s
The work done on an object by a net force equals the change in kinetic energy of the object.
So,
W = Ek
= 1/2mv²
= 1/2 * 70 * (80/9)²
= 35 * (6400*81)
= 2765.43 J Ans.
Ans.) The work done is 2765.43 J.
Similar questions