Answer:
2000 N
1600 N
Explanation:
Step 1:
It is given that the bear's weight is 2000 N and it slides down the tree with constant velocity. Since it is sliding with constant velocity the overall force on the bear is zero. The weight of the bear acting downward balances the upward force caused due to friction. Hence the upward force equals the weight 2000 N.
Step 2:
It is given that the bear slides down with an acceleration 2 m/sec sq
Weight of the bear = 2000 N
Mass of the bear = 2000/10 (taking g = 10 m/sec sq)=200 kg
Force = Mass * Acceleration
Hence net force acting downward = 200*2=400 N.
Net force = Weight of bear - Force acting upward on the bear
400 = 2000 - Force acting upward on the bear
Force on the bear acting upward = 2000 - 400 = 1600 N
