Advertisements
Advertisements
Question
Advertisements
Solution
K.E = `1/2` mv²
60 = `1/2` (30) (v)²
or v² = 4 m/s
or v= 2 m/s
APPEARS IN
RELATED QUESTIONS
State the law of conservation of energy.
What is the relationship between Nm and dyne cm?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
