Last seen: Nov 14, 2021
Height, h = 100m Acceleration due to gravity, g = 9.8 m/s2 Work done by the boy, W = mgh = 49kJ Potential energy gained = work done by the boy...
Height, h = 10 m Acceleration due to gravity, g = 10m/s2 (a) Work done, W = mgh = 10kJ (b) Potential energy of the body = work done = 10 kJ
Mass of car = 1000 kg Initial velocity, u = 20 m/s Final velocity, v = 10 m/s Retardation = a Distance covered = s Using third equation...
Mass of rock = 10 kg Height of ladder, h = 5m Initial velocity of rock, u = 0 Final velocity, v g = 10 m/s2 Using third equation of moti...
Mass of scooter + scooterist = 150 kg Initial velocity, u = 10 m/s Final velocity, v = 5 m/s Retardation = a Distance travelled = s Usi...
Mass of body = 2 kg Initial velocity, u = 0 Time taken, t = 2 s Acceleration due to gravity, g = 10 m/s2 Final velocity, v = ? Using the...
Let masses of the two objects be m v1 = 2 m/s v2 = 6 m/s KE1 = m.(2)2 KE2 = m.(6)2 Ratio = =
KE = 20 J Mass = 100g = 0.1 kg KE = mv2 v2 = 400 v = 20 m/s Momentum = mv = 2 kg.m/s
Mass = 200 g = 0.2kg Height = 5m Initial velocity, u = 0 Acceleration due to gravity, g = 9.8 m/s2 Final velocity, v Using third equatio...
(a) Positive work: When a ball is thrown upwards, work done by the force is positive work. (b) Negative work: Work done by the gravitational force ...
(a) Kinetic energy is directly proportional to the speed. (b) Kinetic energy is directly proportional to the mass.
W = F cosθ s Where, W is the work done F is the force applied s is the distance travelled by the body θ is the angle between the direction...
(a) The force applied by the boy is a positive work as it is in the direction of motion of the body. (b) The work done by the gravitational force o...
Yes, it is possible that a force is acting on a body and still the work done is zero. When a man is pushing a wall, work done is zero as there is n...
Following are the quantities on which the amount of work done depends: (a) magnitude of the force (b) distance through which the body moves Forc...
(a) Force, distance (b) Zero (c) Newton, meter, force (d) Energy, kinetic energy (e) Mechanical
(a) Potential energy (b) Kinetic energy (c) Potential energy (d) Potential energy (e) Potential energy
Potential energy is directly proportional to the height. Therefore, when the height is doubled, potential energy also gets doubled.
False PE = mgh = (1) (9.8) (1) = 9.8 J
Mass = 100 kg Height = 5 m g = 9.8 m/s2 PE = mgh = 4900 J Work done = potential energy