Whether truck comes to a stop by crashing into a haystack wall, the is both the

Question

Whether truck comes to a stop by crashing into a haystack wall, the is both the same gimp with the haystack greater with the brick wall A Wale expert executes a swift blow cartel breaks a cement Mock with her bare hand. The magnitude of the force on her hand is more than the force applied to the block. zero the same as the force applied to the block. lest than the force applied !o the cement block. need more information It is correct to my that impulse is equal to velocity multiplied by time. corresponding change in momentum force multiplied by the distance it acts. momentum. Recoil is noticeable if we throw a heavy ball while standing on roller skates. U instead we go through the motions of throwing the ball but hold onto it our net will be the same as before. small but noticeable. A feather and a coin dropped in a vacuum fall with equal accelerations kinetic forces duo to gravity. none of the

Explanation / Answer

17) Since Kim and Jim pulls the toy with equal force in opposite direction they get canceled .The resultant force is the 15 N force exerted by Tim
The acceleration of the body depends on the mass of the body.Since we are not provided with the mass of the toy ,the acceleration of the toy is unknown
18) During the free fall,the acceleration of the body is constant. The force is thus F = m g is the weight of the body .
The apple's weight is given as 1N .The force that the apple can exert is also 1N .
ans: C
19) We can use the conservation of momentum to find the final velocity
m1 v1 + m2 v2 = M V
m1 = 5000 kg v1 = 2 m/s m2 = 10000 kg v2 = 0 M = m1 + m2 = 15000 kg
5000 x 2 + 0 = 15000 x V
V = 10000 / 15000 = 2/3 m/s
20) Using the conservation of the linear momentum
m1 V1 = m2 v2
Where m1 and v1 are the mass and the recoil velocity of the rifle ,m2 and v2 are the mass and the velocity of the bullet
v1 = m2 v2 / m1
v1 = 0.01 kg x 200 m/s / 2 kg
v1 = 1 m/s

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