Answer: a) v=2.45
b) v=2.83 m/s
Step-by-step explanation:
Kinetic energy = 1/2 m*(v)^2 where m is mass and v is velocity.
Since the mass is 400 kg we plug in and solve for v
a) 1,200 J = 1/2 (400) v^2
1200= 200*v^2
6 = v^2
v= 2.45 m/s
For b do the same thing.
1600= 1/2 400 v^2
8=v^2
v=2.83 m/s
Hope this helps