Q. A child whose weight is 262 N slides down a 4.80 m playground slide that makes an angle of 49.0° with the horizontal. The coefficient of kinetic friction between slide and child is 0.0910. (a) How much energy is transferred to thermal energy? (b) If she starts at the top with a speed of 0.565 m/s, what is her speed at the bottom?
Q. A 0.300 ice puck, moving east with a speed of 4.50 , has a head-on collision with a 0.700 puck initially at rest.
a. Assuming a perfectly elastic collision, wht is the speed of the 0.300 kg object after the collision?
b. What will be the speed of the 0.700kg object after the collision