Question

A block of mass 2kg, which has an initial speed of 7m/s at time t=0, slides on a horizontal surface. Find the magnitude of the work that must be done on the block to bring it to rest.

Answer 1

Below

Step-by-step explanation:

The Kinetic Energy the mass has ( 1/2 mv^2) is the amount of work that must be done to bring it to a stop

work = 1/2 (2 kg) ( 7 m/s)^2 = 49 J