Question

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car,

increasing the speed to 3.2 m/s. How much work did the man do?
A. 2816 J
B. 3435 J
C. 2197 J
D. 4123 J

Answer 1

C

Step-by-step explanation:

A P E X

Answer 2

C. 2197 J

Step-by-step explanation:

The work done = Energy change

The work done by man = Kinetic energy change of the car

Kinetic energy is the energy possessed by a moving object solely due to its motion.

You can get the K.E. of an object using the equation,

K.E. = (1/2)mv²

So you get,

The work done by man = K.E. change of the car

= (1/2)×550×(3.2)² - (1/2)×550×(1.5)²

= 2197.25 J