Eli stands on a skateboard at rest and throws a 0.5 kg rock at a velocity of 10.0m/s. eli moves back at 0.05m/s. what is the combined mass of eli and the skateboard

m = mass of the rock = 0.5 kg

v = velocity of the rock = 10 m/s

V = velocity of eli in opposite direction of the rock = - 0.05 m/s

M = mass of eli and skateboard together = ?

V' = velocity of combination of rock , skateboard and eli together before rock is thrown = 0 m/s

using conservation of momentum

total momentum after throwing rock = total momentum before throwing rock

mv + MV = (M + m) V'

(0.5) (10) + M (- 0.05) = (0.5 + M) (0)

M = 100 kg

the rearrangement of particles in a physical change. hope this

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.