A car is accelerated on a leveled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car:

A. Does not change

B. Becomes 4 times that of initial kinetic energy

C. Becomes 8 times that of initial kinetic energy

D. Becomes 16 times that of initial kinetic energy

If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (g = 9.8 m/s²)

A car is accelerated on a leveled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car:

A. Does not change

B. Becomes twice that of initial potential energy

C. Becomes 4 times that of initial potential energy

D. Becomes 16 times that of initial potential energy.

In case of negative work, the angle between the force and displacement is:

A. 0^o B. 45^o

C. 90^o D. 180^o

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

A. Acceleration

B. Momentum

C. Potential energy

D. Kinetic energy