A man powered 30kg lawnmower is being pushed, from rest, with a force of 50N at an angle of 30 degrees below the horizontal for 10m on a level lawn in 5s. The force of friction is 20N. Find the average power output of the man on the lawnmower.
How fast is the lawnmower moving at 5 seconds?
Determine the power output of the man at exactly 5 seconds.

The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.