Work and energy

If a mass of 5 kg is lifted upto 5m height what will be the work done against the gravitational field

• 49J

• 245J

• 25J

• 98J

One erg is equal to

• 10^-7 Joules

• 10^-5 dynes

• 10^-5 watt

• 10^-7 newton

Kilowatt hour is unit of

• Power

• Energy

• Force

• All

The average force necessary to stop a hammer with 25Ns momentum in 0.05 expressed in N is

• 500

• 50

• 125

• 25

Work is a ............ quantity

• Vector

• Scalar

• Fundamental

• Conservative

The SI unit of work is

• Joule

• Newton

• Dyne

• Erg

Power is a ........... quantity

• Scalar quantity

• Vector

• Both

• None

K.E is a ...........

• Scalar

• Vector

• Both

• None

Rate of change of displacement is defined as

• Acceleration

• Velocity

• Speed

• Uniform velocity

If a body fall down with the velocity of 10 m/s what will be the height

• 100m

• 10m

• 5m

• 7m