DeShawn asked in Science & MathematicsPhysics · 1 month ago

Physics Work Magnitude HELP!!!!?

Given that the tree doesn’t move, and the car comes to rest:

a.) Find the amount of work done by the tree on the car as the front of the car crashes into the tree, but use m = 2525 kg instead.

b.)  Find the magnitude of the force that pushed in the front of the car by 42.0 cm

Relevance
• 1 month ago

Kinetic Energy in J if m is in kg and V is in m/s

KE = ½mV²

KE = ½2525(12)² = 181800 J

Find the magnitude of the force that pushed in the front of the car by 42.0 cm

assuming this means the car came to a stop in 42 cm with constant acceleration

v² = v₀² + 2ad

0 = (12)² + 2a(0.42)

0.84a = –144

a = –176 m/s²

F = ma = 2525 x 176 = 443000 N

• 1 month ago

energy = 1/2 m v-squared

we need to know how long the crash took (from beginning of crash to end of crash)

or the rate of deceleration

in order to calculate the force

• DeShawn1 month agoReport

Please submit answer with work instead of instructing what to do.