A plane starting at rest at one end of a runway undergoes a uniform acceleration of 4.8 m/s 2
for 15 s before take-off. What is its speed of takeoff?

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative