W = work done by the spring on the toy car = 196 Joules
m = mass of the toy car = 2 kg
v₀ = initial velocity of the car when at rest = 0 m/s
v = final velocity of the car after spring does work on it = ?
According to work-change in kinetic energy, net work done on an object is same as the change in kinetic energy of the object . hence
Net work done = Final kinetic energy - initial kinetic energy
W = (0.5) m (v² - v₀²)
inserting the values
196 = (0.5) (2) (v² - (0)²)
v² = 196
v = sqrt(196)
v = 14 m/s
The answer to this question is Helium
Answer:
A. Kicking a soccer ball past the goalie to score a goal.
Explanation:
Answer:
Explanation:
The man comes to halt due to reaction force acting on him in opposite direction . If R be the reaction force
impulse by net force = change in momentum
Net force = R - mg , mg is weight of the man .
( R-mg ) x 2. 07 x 10⁻³ = 73 x 6.46 - 0
R - mg = 227.81 x 10³
Average net force = 227.81 x 10³ N .