23. A board for a shelf is 2.31 m long and 33.4 cm wide. to. What is the area of ​​the shelf in square meters? b. What is the perimeter of the shelf in centimeters? c. Which will reduce the area of ​​the shelf more: (1) cutting 3.4 cm from its width, or (2) cutting 0.31 m from its length?

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?